That's all that things become. In the past, and a memory.
One year ago, I was in a situation where I like someone and they didn't like me but I was taking to them everyday and we were great mates. Now, I don't like her that way and we don't really speak at all. Yet what was going through my mind back then was completely different.
Going back 6/7 months I liked someone else and things were looking good, we were talking a lot, she actually said she liked me (the way I liked her) and things did happen (nothing serious) but I scared her away. Now I don't like her that way anymore and we don't really speak either, but I do miss her, and I miss the friendship.
That's what I always miss more, the friendships.
I start talking to someone I like and then we become quite good mates, but then I scare them away and then I'm left alone again, simply to start the cycle again.
Life is brilliant like that, it's great...
If you think something is too good to be true, then chances are it isnt.