Is it normal to have crushes while in a committed relationship?

I've been with my boyfriend for a few years, and I really love him. the problem is, I've developed a crush on another guy. my boyfriend is totally awesome, really supportive of me, and we have a lot in common. the other guy is my exact opposite. he isn't a jerk exactly, but has a stand-offish attitude, and has opinions about things that are way different than mine.

he hasn't come out and said he's into me, but there are definite signs that he might be. I don't really want to break up with my boyfriend, but I don't know why I feel so strongly about this other guy. do other girls have the same problem? what should I do, pursue the other guy or stick with my current boyfriend?
Is it normal to have crushes while in a committed relationship?
Post Opinion