Guy's Behavior

I asked my boyfriend if we're still okay and he just said "I guess"?

He's been very distant this week. Hasn't called me or texted me at all, and when I texted him his replies were very cold, pretty much one word sentences. We only see each other once or twice a week because he works til late at night, and we never talked much during weekdays but we always reached out at least once a day to just check in. I always text him goodnight before bed and he replies goodnight back. Now a few times in a row he totally ignored my goodnight messages and didn't reach out first the whole week. I was worried so I asked him what's up and if we're still okay and he said "I guess". Just that. I then called him and asked what does that mean and he said he doesn't want to talk over the phone that we'll talk on Sunday (we always spend Sundays together). I have no idea what's going on with him, did he lose interest? That call was 3 days ago and he's still MIA. So I'm basically just waiting for Sunday to have that talk.
I asked my boyfriend if we're still okay and he just said "I guess"?
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