What did God repent of for you?
Sin. Repentance literally means to turn. It's not new years eve resolutions to stop smoking or drinking, etc. It's turning from a life of sin to submission to Jesus Christ.
Making Jesus Lord of your life, committing your soul to His care, is repentance. His work of sanctification in us is showing us our sin, and our part is confessing that what He shows us is sin and then striving against it, but when we do sin despite our attempts not to, the blood of Christ cleanses us of that sin every day. This isn't my idea, but what scripture teaches.
6 If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth. 7 But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us. 1 John 1:6-6-8
Verse 7 speaks about fellowship with Christ as walking with Him in the light, but you need to understand what John meant by "light". Scripture says that God's light issues from His word.
Your word is a lamp to my feet
And a light to my path. Psalm 119:105
Your testimonies are wonderful;
Therefore my soul keeps them.
The entrance of Your words gives light;
It gives understanding to the simple. Psalm 119:129-130
Then Jesus said to those Jews who believed Him, “If you abide in My word, you are My disciples indeed. John 8:31
If you abide in Me, and My words abide in you, you will ask what you desire, and it shall be done for you. John 15:7
Examine me, O Lord, and prove me;
Try my mind and my heart.
3 For Your lovingkindness is before my eyes,
And I have walked in Your truth.
4 I have not sat with idolatrous mortals,
Nor will I go in with hypocrites. Psalm 26:2-4
The entirety of Your word is truth, And every one of Your righteous judgments endures forever. Psalm 119:160
16 They are not of the world, just as I am not of the world. 17 Sanctify them by Your truth. Your word is truth.
John 17:16-17
Our nature according to the flesh wants to be busy working for righteousness, but Jesus was clear about what was important for His disciples to do:
28 Then they said to Him, “What shall we do, that we may work the works of God?”
29 Jesus answered and said to them, “This is the work of God, that you believe in Him whom He sent.”John 6:28-29
38 Now it happened as they went that He entered a certain village; and a certain woman named Martha welcomed Him into her house. 39 And she had a sister called Mary, who also sat at Jesus’ feet and heard His word. 40 But Martha was distracted with much serving, and she approached Him and said, “Lord, do You not care that my sister has left me to serve alone? Therefore tell her to help me.”
41 And Jesus answered and said to her, “Martha, Martha, you are worried and troubled about many things. 42 But one thing is needed, and Mary has chosen that good part, which will not be taken away from her.” Luke 10:38-42
You'll notice that Jesus wasn't condemning of Martha's service, but commended Mary for sitting near Him and hearing His word (the "one thing is needed"). His Spirit transforms us through His word, and applying His word to life.
12 I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. 2 And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God. Romans 12:1-2
You'll notice that verse 12:1 says to present ourselves as a living sacrifice, but "by the mercies of God."
Mercy is always the expression of forgiveness, so our "work" is accepting His forgiveness in sanctification, trusting in His blood to cleanse us from all sin, and not that we are sinless, but seek His righteousness. Recognizing our sin and believing in our forgiveness is what creates our love for God.
Therefore I say to you, her sins, which are many, are forgiven, for she loved much. But to whom little is forgiven, the same loves little.” Luke 7:47
9 In this the love of God was manifested toward us, that God has sent His only begotten Son into the world, that we might live through Him. 10 In this is love, not that we loved God, but that He loved us and sent His Son to be the propitiation for our sins. 11 Beloved, if God so loved us, we also ought to love one another. 1 John 4:9-11
Sanctification is accomplished by returning God's love, a love expressed in forgiveness of sin. His commandment is to love one another. Love fulfills all the commandments but it should be understood that this "love" isn't simply warm fuzzy feelings, but doing, extending mercy and grace to others.
And this is His commandment: that we should believe on the name of His Son Jesus Christ and love one another, as He gave us commandment. 1 John 3:23
I've heard some say that we satisfy God by obeying the ten commandments, but that ignores what Jesus taught:
37 Jesus said to him, “‘You shall love the Lord your God with all your heart, with all your soul, and with all your mind.’ 38 This is the first and great commandment. 39 And the second is like it: ‘You shall love your neighbor as yourself.’ 40 On these two commandments hang all the Law and the Prophets.” Matthew 22:37-40
The point being that you can not love your neighbor without loving God with all your heart, soul, and mind, and that love does no evil to a neighbor. This love is the expression of His mercy and in a word, forgiveness, first His forgiveness of our sin, then our forgiveness of our neighbors sin.
Grace goes beyond mercy.
And whoever compels you to go one mile, go with him two.
Matthew 5:41
If you can do these things without Christ, you prove God mistaken, but I know that my God can do what I'm not able to do for "I can do all things through Christ who strengthens me." Philippians 4:13
We are not complete in ourselves or in a spouse, but we are complete in Christ. His righteousness is sufficient to change us, to accomplish what we can't accomplish in ourselves, and to make us acceptable before God. Amen