Rejected befor sex? Do i get in contact?

So, I’ve known this guy for around seven years since our school days, we have always kept in touch and both had known there was a connection between us. Finely after years of keeping in touch we meet up at my house, everything was great nice wine good convocation laughs all the way...we both seemed to be in to it...so the night went on and we ended up in bed together kissing etc (it felt so right)....and then BANG! As soon as we were just about to have sex (we where both naked at this point) he say "sorry I cart do this" "it’s not you it’s me" "not be able to since my last girlfriend". He then said he wanted to leave and he felt bad WTF! Help? I’ve never felt so humiliated in my life; I could not believe that I had let this person in to my life I totally blamed myself for a long time. It never had my feelings hurt so badly! It was not meant to happen like this. What makes it worse now it that he’s not been in contact, it been over 3 months? I really need answers as to why this happen to me, do I get in contact with him…what would I even say?

Any comments will be helpfull