My boyfriend tends to be quite dismissive.

I’ve been with my boyfriend for a year and a half. He’s 26, and I’m 25. He’s a pretty laid-back and easygoing guy—doesn’t stress much, is super patient, soft-spoken, and tends to keep to himself. You know the type. Lately, though, I’ve noticed he doesn’t really express his feelings, which I get is common for a lot of guys. However, he can also be quite dismissive overall, and I’m starting to feel uncertain about that. For example, one of his friends is going through a divorce—he’s a bit of a wild card, drinks a lot, and lives a reckless lifestyle. This friend has asked my boyfriend to move in with him at his new condo. My boyfriend was expecting this and is considering it. That honestly worries me; I really don’t want him to move in with someone who’s a bad influence. While I trust my boyfriend’s loyalty, I’m not sure I trust the combination of him and his friend. I brought up my concerns, saying I don’t think it’s a good idea for him to move in. He just replied, "Okay." When I asked if he wanted to know why, he shrugged it off, saying, "I don’t really care; that’s your opinion," and then changed the subject completely. This is just one example of his dismissive attitude that I’ve noticed a few times now. Should I be concerned about this behavior? Am I overreacting for feeling uneasy about it? Or is it wrong of me to have an opinion on whether he should move in with his friend?