Why am I suddenly disgusted and irritated by my long-term partner?

So, I am a 26 year old F. I have been with my partner for almost 10 years. Lately, he’s been disgusting me & a lot of things he does irritates me. He started trucking 2 years ago and is home 1-2 days out of the week. He has progressively gotten lazier. He doesn’t wear deodorant and showers once a week. Luckily, I only see him 1-2 days. He irritates me though he tries being funny and it’s just annoying and he intentionally pushes my buttons. We were at the casino, he lost his money and I was enjoying myself (I only get 1-2 days without my daughter every two months or so). He was pushing the slot buttons which make a loud sound and I asked him to stop and he kept doing it, I got irritated yelled and he laughed. Tonight I tried going down on him and he farted basically in my face. It’s gotten so bad I’ve had him sleep on the couch the last 3-4 times he’s had days off. I’m a very patient, understanding and a very forgiving person, I’m not sure what’s wrong with me I’ve never felt disgust or irritation for a person before. So much so I’d rather him stay out on the road.
Why am I suddenly disgusted and irritated by my long-term partner?
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