Could this be a false allegation ?

I’m not sure where else to turn I’m mental and physically drained ….

Me and my partner went on a night out to our friends after 10 months of not having a night to yourselves as looking after our little boy

My partner drunk whole bottle of alcohol I didn’t realise I didn’t want him coming home as he was very drunk and annoying so I asked my friend if he could stay we been friends for ages , she took him on

She messaged me he’s making abit of a move on her I rang having a go and telling him to go sleep yes I could of picked him up but I never and I blame myself for it he stormed out but my friend spoke to him and managed to get him back to hers then 6am she rang crying he’d raped her …… haven’t seen him since but spoke to the mother in law she said he said it was consensual there’s no marks on either of them she claims he gave her a hickey no scrams bruising or anything , he said that during he said to her don’t tell my gf she then said no no stop and that’s when he got off and walked away now who do I trust ? If he wanted to rape her wouldn’t he finished she’s still going out drinking but apparently can’t stay in her flat mentally I can’t deal with it myself betrayed by the most important people and iv got a baby with him I’m not blaming the alcohol but surely he was that drunk she could of pushed him off Is guilty catching her up now ?she claims she told him no 20 times

Our family is ruined