Sorry if this is a long post.
I've been with my partner for 4 years but I feel like I don't know what a normal relationship is like anymore. When I first met him I was sure he was the love of my life and the thing I liked the most about him is that he was so honest, caring, we had so much in common. Felt like the most balanced and mature relationship I ever had, like we were best friends and lovers at the same time. Now I find myself crying almost every week and uncapable of talking to him about what upsets me anymore because he always acts like I'm over reacting and not taking me seriously. About 2 years ago the issue was decreased sex, in all my previous relationships I was used to getting a lot of physical attention from my partners and I didn't mind that he wasn't as sexually active but there were times when I tried to initiate and he would just say no. Then it got to the point where he never ever wants to do it, doesn't ever compliment me, we don't cuddle in bed and if I'm always the one saying 'I love you', hugging him, kissing him, grabbing his hand, suggesting dates etc. There is 0 effort from him. I know that romance and sex decrease over the years but didn't think it would be all over so soon. The other thing that bugs me is that I think he grew up in a household where his mum was the only one cleaning and he was never expected to do anything. Therefore he's really bad when it comes to cleaning the house and doing chores, I've tried many times to talk about it with him trying to make him understand that it's not that he needs to help me but rather look after his own house. Every time he does more for about a week then goes back to doing nothing. I could walk in front of him 3 times whilst he's sat on the sofa watching tv, with a load of washing to hand or the hoover, and he doesn't even ask if I need a hand. Even when we watch tv he'd say something to me about the program and I reply but when I say something he doesn't listen to me and when I ask him why he's not replying he says it's because he's watching tv and concentrating. It all feels very one-sided and like I'm his flatmate rather than girlfriend. The depressing thing is that in the past 2 years I've been suffering with weight gain and hair falling out, all things I've talked to him about but he shrugs it off. But now I'm somehow thinking he's just not attracted to me anymore but too coward to tell me. Previously when we discussed things and had arguments he used to get very upset at the idea that he hurt me and genuinely tried to do better. Now the first thing he does is deny and then try to blame me for the issue. Another thing I thought about is that he's not happy with his career but he is also quite passive about it (he hasn't done much to look for another job). I don't know what to do anymore, it's been 4 years and things are only getting worse. I feel very scared to leave him, I still love him, but I'm scared that 4 years from now I will regret not leaving?