Advice about my crazy bf

So my bf started acting strange, seemingly overnight, and wouldn't explain why. His English isn't amazing but we can understand each other most of the time. He stopped wanting to kiss me or touch me and we hadn't had sex for over 10 days (usually every night!) I tried giving him space and talking to him but nothing. He then accused me of sleeping with my pregnant friends bf out of nowhere (I definitely did not cheat on him!) and now he won't speak to me at all about it. I haven't seen him for over a week and he asked me not to contact him as he needs space but he still calls me when he's drunk telling me he loves me every few days! What do I do? Leave him alone to realise he was wrong and come back or try talking to him? My heart is breaking and we were perfect before so I don't understand why he suddenly changed or why he thinks I cheated on him! 😥😥😥💔💔💔