I got involved with a married girl about 4 months ago. I was close friends with this couple and ended up alone in a situation where fondling each other was involved. Our clothes stayed on, but obviously this was too far.

I felt God's conviction over this and and confessed and repented to the husband as well as my pastor. God severely punished me with a deep internal pain that comes and goes, but mostly has stayed inside me for the past 4 months. The pain is very similar to how David describes his pain in Psalm 38:1-10. It's a pain that's taken away my energy and motivation. I've made it to the gym a couple of times since and I physically can't workout. I don't have any focus or motivation for any of my typical activities beyond the bare minimum. I can't eat as much as I used to. I only feel this pain in my belly that only goes away after much prayer and fasting, but only after much prayer and fasting and relief is temporary. I feel physically, mentally, emotionally, and spiritually destroyed. I have sought counsel and prayer from pastors, and I am putting boundaries in my life to prevent this from happening again.

For some context, before I made the string of foolish decisions that led to this sin, I was a dedicated Christian who was really trying to better follow God with my life. I've struggled with lust my whole life and have put in place accountability software on my devices to stay off of porn. The areas I've failed and allowed lust to have the best of me was in texting and being alone with this woman, especially when she's made advances at me. I know I have severely screwed up here and am working on restoring my walk with Christ and salvage is left of my Christian life.

My questions for you guys are:

Have any of you fallen into adultery and experienced the pain I described above (2nd paragraph)?

How do I get through this (the pain and experience in general) and return to a fruitful Christian life?

Any encouragement would be appreciated.