Do you think it's alright if I wake up a fuckbuddy who had said he wanted to meet up?
Why didn't you originally meet up if he wanted to?
I was going somewhere else, but I met a girl who brought me here.
You shouldn't wake him up if you didn't initially accept his invitation. You had a choice and chose not to do it so just wait until next time.
I'm going to go settle this with him.
I don't think this is the right time to settle anything with him, because he's asleep. If you wake him up he's probably going to be really annoyed at you. I think you should wait until tomorrow to talk to him.