First of all, who's dating the guy - you, or the everyone crowd?! Don't listen to anyone except yourself...maybe, as awkward it could sound, people are just jealous. Do you think he's weird?
Becausee you don't trust your boyfriend! Or maybee that girl is a bitch and you know she could mess up your relationshhip! Talk with your boyffriend about this he could help you get over that jealousy,
His your boyfriend you should know! Not to be mean ! Talk about you guys, gossip, keep him entertain , go to the movies to a carnival something!