You are right.
The secrecy means it was an affair.
There is _absolutely_ no excuse for my behaviour.
I regret sleeping with you; I wish the circumstances had been different.
Rationally, I knew it was wrong, but I was weak, and let physical, intellectual and emotional attraction overcome me.
I sabotaged things from the start; what hope could any relationship have, starting in these circumstances?
If only I’d had the strength to end one relationship before attempting to start another.
Now I’ve lost you as a friend as well, and I recognise I need more friends like you.
You are much stronger than you realise.
I am glad you touched my life.
I learned a lot about myself from you and from this experience.
I expect that only time will heal my lovesickness.
Hopefully, eventually I can forgive myself, and become a better person.
My biggest regret is letting my own anxiety and insecurity cause you so much stress, especially given what you’re going through.
I am deeply sorry.