Thinking of another guy. Help!

So I'm in a long distance relationship with my boyfriend for 8 months now. He's supposed to come back next month. We've been together for a year and a half.

Then this semester in uni I get to know this other guy and honestly he gives me all the butterflies. We barely know each other and we don't really talk, maybe I'm just having a crush on him.

It makes me feel really bad and I don't know if this is just a phase. It's not like I don't love my boyfriend anymore, but I'm attracted to someone else too.

What should I do? I mean I dont even know the guy that well, we've only talked twice I think.