Should I get over my boyfriend jokes?

Recently he told me how he jokes around with his friends, but he’s told me it doesn’t mean anything, he’s not attracted to them that they are just jokes. He said he’d like to joke around with me like that but he can’t because he said I’d just get upset and change moods. An example of joke he gave me was “look that girl over there got a rubber gyat”

He said it doesn’t mean anything and he’s not cheating, that he wants to stay with me forever blah blah, but I feel differently about him saying that stuff it makes me insecure really, but he said that’s just how he is. I’m not saying it’s all he talks about with them either, he likes other types of jokes with them like dark humor or whatever but he said there’s nothing sexual or any attraction he’s just making jokes.

Idk how I should feel really or if I’m just gullible or being emotional because I’m currently 9 months pregnant so idk.