The long distance thing is hard. We're going through that right now with our girlfriend.
You just always have to tell yourself that trust is the building blocks for a relationship........without it, the relationship won't ever work. So if something is bugging you, you just have to talk about it and get it out of your system. It typically ends up being something with no value to it at all anyway! LOL!
Long distance is hard, anyone who's ever done it knows how difficult it can be.
I don't really have any advice, just wanted to say that you're not alone!