I keep finding hair that’s not mine in my boyfriends room. I have dark brown short hair. What do I do?

I’ve been with my boyfriend for 14 months now. Over the past 6 months I’ve found a blond hair once on his pillow and a Once a blond hair on his dresser and once in his car in the. I also have found probably 20 pieces of blond hair on his floor and I confront him every single time. The first few times he laughs and says he has no idea but now that we’ve fought about this about 20 times he gets quite. Says he has no idea and it could be a, b or c but he doesn’t care because it has nothing to do with him. To be fair, he has a roommate who has had 3 or 4 different girls at the apartment weekly who are all blond. But could it really be carried into his room that much? If it wasn’t for the constant hair, I wouldn’t think he was cheating. He’s very open with his phone, and I’ve gone through everything before and found nothing. He involves me with his family. He always answers his phone no matter when I call him and we text frequently when we aren’t together. Am I just being paranoid? Help! P. s his roommate knows I make a fuss about this so I wonder if he plants hairs to be funny. He is a cruel person and he’s made jokes to my face about my obsession with the hair!
I keep finding hair that’s not mine in my boyfriends room. I have dark brown short hair. What do I do?
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