I (M19) made pals with a guy through work but made much better friends with his gf who also worked with us. It was all going fine, I hung out with his gf an occasionally he would show up and we'd all hang out together. I thought hes pretty immature and loud but if his gf's happy whatever, it's not my place... until

1) After convincing me to drop out of a flat arrangement with my friends and move in with him and gf he dropped out at the last possible minute. He comes round every week, stays for 3-4 days giving me advice how to organise the flat despite paying zero rent. Did I mention hes broke two door handles and our toilet in the last month?

2) had a paranoid episode(?) and accused me and his gf of fucking by showing up at our flat early morning. His evidence was we were being too friendly - despite the fact he had everyone opportunity to live here

3) makes insentive comments while drunk without thinking ahead. From telling his gf she'd be better killing herself (theres a lot of backstory but recently -past year- shes attempted suicide) and made jokes because I was half irish I knew terrorists?)

Know me and gf's relationship is fucked