my partner never wants to do anything

I’m currently 22 weeks pregnant and in the beginning I never wanted to do anything I was just so tired.

Now I really want to be going outside and enjoying the summer. going to the lake or something like that. but my partner never wants to do anything. he always says “maybe” and then it never happens. We just watch tv and he spends his days smoking weed, and then when he runs out of his weed he spends that day trying to get more weed and then it’s a cycle. I feel like I can’t even ask anymore because it never happens and he seems to get annoyed when I suggest that stuff, which then makes me scared to ask. the only time I do anything is when we need something from the store or when I have my mom come get me so I can hang out with her for a bit. what can I do? he gets so offended when I say “well why cant we go do something?” He gets offended and angry if I suggest anything ever.