Similar experience here. My ex was the person that I lost my virginity with. This was almost 10 years ago. In the beginning, I didn't want to do it. It stayed that way for a while but then I started to feel a little guilty because of it. Needless to say, she convinced me into doing it. It wasn't forced as she asked me countless times if I was ok with it.
Anyways, later in our relationship things started to progressively get worse and we ended up breaking up. The people I knew then were telling me that she was cheating on me and I saw some signs that made me realize it. I forget her reasons as to why she broke up with me but I remember it being a bunch of bull. Couple days after that I was walking with a group that included my ex and her new boyfriend at the time. We were walking into the woods and some of the guys we were with started walking back. It was only me, my ex and the boyfriend that were alone in the woods. So what happens? Well the two of them started to do it. In front of me.
I mean, I was fortunate that I had my iPod with me already listening to my music. So I didn't need to hear their... mess. I didn't know what I was thinking at the time and I should've seen it coming. I didn't even feel angry. It was truly one of the moments where I felt absolutely nothing. Later that evening I was going to a college bar with my college friends. I started drinking a lot. Way too much that I blacked out. Turns out that I got thrown out of the bar by the bouncers. I was left out on my own doing whatever. Apparently I was screaming, yelling and falling over a lot. Crossed over a road with a bunch of vehicles. It's amazing that I didn't die from being hit by a vehicle. My friends managed to find me by some miracle. Woke up to see myself having a black eye and bloody knees.
It took me awhile to move on. Took me even longer to recover to a functioning level. I understand how much hurt you are going through now. All I can say is that you can't ever forget her and the situation. She may have abandoned you but there are others that won't. Me included. I hope you can take the time and choice for coming out on top. So for now, take it easy.