Cheated with friends family member

Well I'm not sure where to put this, or where to even start.

I guess a little about me!
I am in a relationship. Things have been rocky for a few months. we have tried everything to make our realationship work, but we're just 2 different ppl.


I've been hanging out with one of my friends (we'll call her Amy) alot lately. just to get away from things.

Thing is she tells me to meet at her place, when I go there its just myself and one of her family members (we'll call them FM). So FM and I have be come close. She told him alittle about my situation, so when we were alone together, we talked, (he was going through a simular situation)

To us (FM and myself) its like Amy was trying to hook us up!
Things were fine for awhile.

FM and I became friends, one night when Amy was out, FM asked me to come over, knowing I was depressed and fighting with my bf. he figured I needed to get out of my depressed ways and have fun!

That night we went out, and ended up making out, (sober, well pretty close to it anyways) realized it shouldn't have happened and stopped.

About a month after this happens, Amy, FM, myself and a bunch of others, go out, have a good time, and all get drunk. FM and I ended up sleeping together.

I ended up telling my friend (thats another story called "Friends Family Member"

I don't know whether to tell my bf since we've already decided to take a break from our relationship.



any advice will help! Thank you!