I think my boyfriend might be (kind of) racist
What makes you think he's racist?
He doesn't like nationality of my friends.
It would be horrible to find out that you have a racist boyfriend, but you shouldn't just assume he has these feelings. You might consider just asking him if he has racist beliefs. That way you don't have to wonder about it any longer.
I'm going to wait for a little while and see if he makes any racist comments.
That's probably a decent approach, too. You don't want to make assumptions about him, but be careful. You'd hate to have him say racist things to your friends because you were afraid to confront him about his views.