Hey there. I think the key to trust is good solid communication. Have you told your bf how you feel about this? Even if your feelings are not something you believe "should" be there if it's bothering you maybe him knowing could help. Maybe setting ground rules would be ok. like, if he's going to text other girls you should be able to text other guys... or maybe you don't as much. It's up to the two of you.

Anyways, I hope it works out. Long distance is NOT fun at all.