Asking him if he’s cheating...

I’ve gotten some weird feelings about what’s going on with my boyfriend. We’ve been long distance for a while and he’s been acting more busy/unavailable. There’s more to it, but I’d rather not explain it. How do you think it’d go If I got to the point and asked “would you ever cheat on me?” I can’t stop thinking about it and I’ve been getting this feeling for weeks now.