Found mascara and nail file in my boyfriends room

My boyfriend has 2 other male roommates but he’s the only one with a gf. The other 2 sometimes do bring girls over and they also just had a party with some friends leaving their purses in his room.

I do see them assuming that something is mine if they randomly see It and then putting it in his room since I’m the only girl that’s consistently here but we both did clean up and it wasn’t there before. I’m going to ask him about it and I’m trying not to assume the worst but I have been cheated on by my 2 ex bf’s.

I kind of just needed to chat it out with girls and I don’t really have girlfriends to just chat about this with. Wish my luck :(