My boyfriend and my cousin ....

I don’t trust my boyfriend and cousin !!

I love them both but tbh, he is super excited when he even interacts with other women , especially if another women compliments him , my cousin has always been super pressed for guys attention , and she’s the type to fall in love with any guy that “understands “ her or have things in common with her , my boyfriend always teaches her something when they see each other and I’m scared they’ll fall in love or something. He before lied about his weight to her to impress her , and he changes his voice to be softer and more flirtatious, I just don’t trust neither of them 😩