Why would someone just decide they don’t like me?

I was getting on well with my housemate however he’s a very grumpy guy. I’m clean, tidy, contribute on time for bills, chatty and get involved but all of a sudden he’s telling people he hates me, ignoring me, shaking his head and rolling his eyes at me, slamming the door when I’m in the kitchen, telling me to stop playing my guitar when it’s a Saturday afternoon and I’m practising in my room (don’t play it often), getting annoyed with me leaving one pan to soak overnight and telling me I do no housework when I have ocd and I am doing all the house cleaning but I don’t make a fuss about it.

Feel sad and upset about this, maybe I’m just a loser .

I even was working in an office job last year and all the people were hitching about me behind my back all the time. I don’t know why I deserve this. I’m friendly, chatty and independent but all this is bringing me down