DK, The pain of losing your first love is always one of the hardest to deal with, it sounds like it's still very fresh and you might still be in the middle of it. Take a little time to heal and clear the emotions taking over you heart & mind so you can look at it with just a little objectivity, so you can try to see if the relationship can be restored & salvaged, or if it is the first heartbreak in a long life of relationships with women.

It also seems that there was a pinch of infidelity going on, so I think you should look at that with a clear eye.

Either way it sounds like from what you say you are young, in your early 20's. There's a lot of life down the road for you, walk it well.