well are you single or have you agreed to be in an open relationship??

No we are engaged and not an open relationship.

Well, I mean I know you care about him a lot. But if your heart isn't telling you're not feeling it, don't get yourself hurt or hurt anyone else. Just do what you to MAKE SURE you want to be with him or if you want to be with someone else. Being engage doesn't make you married yet. You still have time that's the point make your feelings be heard.

I know how i feel about him and i don't want to lose that. It's not that i don't love him or care for him or anything but if he doesn't get his act in gear then i don't how will we can be together. Like he needs to man up big time.

What's he doing and not doing?

Just causally thinking about it, or actually talking with this other person about starting a relationship? 

Just thinking about it. I had a cruh on this guy a few years ago but never really talked to him. But now he's on Facebook and so i am tempted to talk to him.

I think just talking is no big deal, but talking with the intent to hook up would be a problem. 

Yeah you mean like chatting on facebook and learning he had a crush on me too but never said anything?

Well like the fact that you two used to crush on each other is really no big deal, it's just that it would be a big deal if you guys decided to act on your (past) feelings. You know what I mean?