My boyfriend works in a bar until about 11.30 on the weekend- he usually goes out for a few after work and will return home semi drunk. Last weekend he came back so drunk he threw up everywhere. Tonight he returned at 5am- 2hrs after everything closed ans said he was 'at the beach'. It's been raining pretty heavy tonight and he had no coat either. I struggle to trust as he has previous history of messaging girls and has slept with someone last year and lied about it for a long time. So tonight I am obviously extremely paranoid that he's gone back with someone after the club. His tshirt was also back to front (plain black- says it had been all night). So I ask him if he's been with anyone and he says no, keeps denying. When he takes his top off he has two sets of nail marks either side of his back. He has no nails- I haven't seen him for over 24hrs so definitely not me. He says he doesn't know how they happened. Bullshit though right? How can I believe that with those perfect scratch marks either side of his back? He says I'm crazy but I know this is no freak coincidence. Thoughts?