Why is my boyfriend avoiding doing stuff?

so I’ve been dating my boyfriend for like 4 months and we started doing a lot of stuff - we haven’t had sex yet but other stuff. (Context: we’ve known and liked each other for like 5 years so we’re not still getting to know one another) Everything is always fine and we’ve both communicated many times that we enjoy it and don’t think we’re moving too fast. But all of a sudden he is avoiding it at all costs. Usually if we hang out with friends he comes back to my house after, but lately he just drops me off because he’s “too tired.” Tonight he kept doing random stuff to avoid even making out with me and I just thought that was weird. It’s not that that’s all I care about in our relationship, but when we’ve made it a habit in the past, I think it’s weird to break it. I don't know how to bring this up to him and I don’t know what I did wrong. He still loves me and cares about me, so I’m trying to forget about it.

Updates
5 mo
Also just as context, he has initiated EVERY single thing we’ve done, which is why I don’t think he’s uncomfortable with it
Why is my boyfriend avoiding doing stuff?
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