HELP!!! ADVICE NEEDED!!!

A fews months ago I got pregnant by my boyfriend of 3 years. He told me to get rid of it and that he wants nothing to do with me or the baby(he was cheating on me). Scared and confused at 21 I did what I thought was best at exactly 6 weeks, terminated the pregnancy. His Bestfriend came and picked up the pieces, even offered to step in as the father roll if I decided to keep it. We got close and down the line we had sex ONCE We are still in the closet about it and not in a relationship either(I do not want to be). SHOULD I FEEL BAD FOR HAVING SEX WITH HIS FRIEND? I actually want more 😩 P.S. It was not out of spite.