Should I forget all about it?

I wonder if I should just forget about what happened. After all, they are the ones who made the first approach to make things better and clear between us. But I was really hurt. And I’m scared that if I let them in again in my life, I would shatter into pieces because they would do the same thing to me again. Another thing, I’m scared that in return, I would be the one who would hurt them, which I don’t want to happen. I don’t want people to loathe me.
In as much as I wanted to let them in again in my life, the fact that my full trust in them has deteriorated makes it impossible to be friends with them again. Doubt has conquered the whole of me and the unconditional love that I have for them before has turned to plain acquaintance.
I realized, I tend to give more and forget myself when I love to the point that I let them use me just to please and give them the happiness they seek. I gave them my trust, and in accordance to that, I give them my love. I tend to pamper people that are very close to me. I care for them, I look after them as if I am a big sister. I spoil them rotten. But after I am hurt, I tend to run away, hide and wallow in self pity asking myself if what happened was my fault. I run away, never comeback, block all the happy thoughts about them as if nothing happy has occurred during the times that I was with them.
The fact that they were able to hurt me after giving them the warning that I am a very fragile person justifies that they aren’t really my friends after all. I tend to warn people about my being emotional about things. And after what they did, I was so devastated that these people really exist.
Now I really wonder if I should really just forget about this whole thing. I want to forget. I guess I’ll be blocking all sorts of thoughts about them from now on so I can move on with my life and be happy with the remaining people who are really true to me and really loves me for who I am despite my attitudes, despite my craziness, despite all sorts of evilness in me. I’m just lucky to have few friends but you can call REAL.