Jealous

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I’m 17 and my boyfriend is 18, we’ve been dating for a year and almost 4 months. he recently went away for college in the fall. he’s in south carolina and i’m in new york, so you can already sense the long distance issue there. i’m still a senior in high school and he’s a freshman in college. when we dated while we were both in high school i never had any issues with jealousy, considering he went to an all boys catholic school. but now he’s away and he has friends that are girls, which i don’t mind and i trust him and them considering they all follow me on instagram and they tell him about the boys they like at school, but i still can’t help but find myself constantly thinking about them or being jealous or comparing myself to them. and i know it bothers my boyfriend and it drives me insane and idk how to stop it. I hate being paranoid and crazy all the time and he gives me no reason not to trust him, it’s just so hard with him there and me here idk. and advice?