See that's what I was discussing with my best friend a few days ago:that men shoudn't get a free pass just because they're men and have needs ..I agree with ChaocInsanity,he should be held accountable for his actions taht aren't justified.

As for what you need to do,I believe you should keep a professional relationship with him.It's easy for men to just want to "go back to being friends" or whatever but yo still have feelings for him to the point that you snapped and told him to off the friendship.
Yes you should have stopped the sexual relationship but you didn't.It's past but you can stop blaming yourself.Forgive yourself for blaming yourself/Now that you know better,you know that there are lines you should not cross.I hope you won't fall for it again and that you won't settle for less.The guy told you he was in love with someone else but you still went ahead .You said he wouldnt do it with you If he was really in love.I am not sure about his feelings but you should control your side of things and do the right thing for yourself first.

Apologize ?Apologize for what ?Don't apologize for feeling what you feel but I guess you could just send him a message saying that you you are sorry If it came out that things escalated a bit ,that you're not here to create drama and If you said hurtful things But no sweet talking or anything and I do think you should keep your distance.Not saying don talk to him but keep ir professional .
In the end ,I believe that deep down you know the right thing to do.Take a deep breathe and feel your inner voice .I believe it will tell you the right thing to do,which at this point seems obvious.. GOOD LUCK

Learn from this situation,don't pull your hair out,take this a life lesson .