several things can be true at once, mc IS insecure, he's overthinking and running around in circles but ml has had the opportunities to communicate with him and he's just really vague about the things that mc stated concerns about. ML doesn't have a way of knowing how profoundly this affects MC, because they don't really know a lot about each other, but I think it's pretty valid to overthink when your partner doesn't even answer your messages for a week and when you bring it up he's just like "it'd be like that something, don't worry about it", it's one way to drive someone up the walls, in my opinion
Why is everyone hating on ML so much I really don't think he's doing anything wrong. They've been dating for a short while, and he has his own life. But he's sweet and understanding.
The MC needs to communicate his feelings.. can't expect someone to be a mind reader.