Should I be concerned that my boyfriend looks up attractive girls from his college on facebook?

[Jess]

I have been with him for a little over 6 months now and I seen on his facebook that he has searched girls from school, not just like 1 or 2, but 5 or 6 a day, for months! I asked him about it and he says that he does not know why he does it, he just likes to get to know them better, although he has never looked up guys on there, only girls. He claims that he doesn't talk to any of them, he just looks at their profiles. I am feeling really insecure about it, as it seems weird that he would be doing this. He says he loves me and he doesn't feel like he is doing anything wrong, but I just can't get over this feeling that he is looking them up for reasons other than what he is telling me. Has anyone else come across this situation? Am I just being insecure, or is this a sign that he could be a cheater?

Thanks!