Am I overreacting?

CONTEXT: I’ve been in a LDR with my boyfriend for a year now. He’s a US Marine and is stationed in Hawaii. I live in Canada. The last time we saw each other was in January as COVID has made travel impossible for now.

PROBLEM: So my bf’s most recent ex (before me) lives in Hawaii and shares a home with a few roommates, one who happens to be my bf’s buddy. My bf has been going over to the house to visit his buddy and his gf at least 5-6 times per month. I understand he wants to hang out with his friend but it makes me extremely uncomfortable that his ex is there and always around. Half the time my bf visits the house he ends up sleeping over there. I’ve talked to him about it on at least 4 separate occasions. I’ve asked him to hang out with his friends in a neutral location instead of always going to that house.

I feel hurt and disrespected. We’re thousands of miles apart so the trust has to be really strong but this is making it difficult to wrap my head around.

I don’t wanna jump to worse case scenario. Do you think I am overreacting/being unreasonable?

Thank you!!