1. For one thing, I don’t see any evidence that this guy is a player. But if you need time to trust someone, that’s fine. Just try not to let it drive you crazy or become over-jealous. Also, have you ever considered starting a long distance relationship? So you can still go to college and have him at the same time. LDR’s are very hard but very worth it, and despite popular belief, a lot of them work out. So think it over and get back to me if you need any more help. :)
2. LDR’s are based entirely on trust, so that’s really all you can rely on with things like this. You just have to trust them.