My boyfriend is acting weird... Update

I'm 20, my boyfriend is 18. We've been together a year and he has been so distant lately and he's been going to the doctor a lot. He lives with his mom. Every time I try to hang out he says he's going to the doctor. The few times we do hang out he doesn't kiss me or have sex with me or show me any affection... He just .... Stares off... I've been asking if everything okay and he says yes. When I ask about the doctors visits he says it's nothing. He texted me saying he had something to tell me but wants to tell me in person. I'm so scared about what he has to say!

Update: I made a post updating already but he has stage 3 lung cancer 😞😞😞