What the fuck????

So last night me and my partner went and stayed in a lovely hotel, we had a really good night. Woke up this morning everything was fine, we were great. Had breakfast etc. Went home, everything still fine. We took our children out for a few hours, still great. The all of a sudden he just completely changed. He went all miserable and cold towards me. Then when I asked what was wrong he starts saying I'm playing mind games and he's had enough of me! So I ask him to give me a bit more detail like how the hell have I played mind games. He said I'm not doing myself any favours by keeping on! What the actual fuck!!! By this point I'm mega confused, I'm racking my brain trying to figure out what the hell I've done. So I just don't bother and enjoy the day out with the kids. The kids are oblivious to all this going on so they're still happy and content and having a great time. When it was time to leave he started acting nice again as if nothing had happened. So I just went along with whatever mood he was in, but being careful not to say the wrong thing because I've no idea whatsoever what his problem was. Anyway, we meet up with his parents and all is well. Acting like nothing has happened. After that we leave to go home. Everything's OK and we order takeaway, the kids go to bed and me and him are good. Then bedtime cones and he turns AGAIN! going on about these stupid fucking mind games again. So once again I say I need you to go into more detail so this can be sorted out. He replied by saying, he hadn't got time for me and doesn't even want to talk to me. He doesn't care about me and he could quite happily kill me. I know he'd never psychically harm me so I ignored the last part. That's just him being a dick. But when I told him I'd leave if he no longer wanted this relationship he wouldn't say that he didn't want me. So now I'm sleeping downstairs on the couch, looking for a place to live. I'm fucking leaving. It's his house but all the furniture is mine! I've had enough