Could someone explain it to me because obviously I don't get it!

So my ex boyfriend told me why he broke up with my two months ago last night, it hurt me pretty bad I had tears to my eyes.. just imagine hearing him say that he didn't rally like you and thought he rushed into it. It hurt me so bad, it made me feel like I was a mistake.. well he kind of apologized but didn't want me to forgive him, he wanted me to move on and told me there was no chance of us getting back together. Today at school I was so upset, I told my friends I hated him and wanted nothing to do with him... yet at work tonight he made it seem like nothing happend he was nice to me, we joked around he stayed on break when I came in, it was great... but the thing is I don't want to like him, why do I like him why am I so quick to forgive him I shouldn't do that it's not fair...I mean I am finding interest in other guys ... there's a sr who I am physically attracted to and attitude wise he's really fun, it's just I don't see it going anywhere I don't think he knows I exist alone.
I have no idea why I'm like this could someone help?

Sometimes it helps to a v o i d a guy when youre in this situation. you need some time without him.

Atleast he was honest, he could have kept stringing you along. Sounds like he made a mature decision, of course it hurts, but it happens, no one likes to be rejected.

I'm not mad at him... just it hurt how he said that to me... he told me he wanted no contact w/ me besides work