Relationships

I have a really bad habit of getting into relationships with people ,who are nice at first then just stop caring . I listen to peoples feelings and am a very honest and open person . I know when to stop speaking and for some reason I don't know why I could work and also cook the next days meals the night before on my workdays and clean the mess I made while still cleaning my partners mess when I get home and it would never be enough . on my days off I dont have a pleasing people issue I just like lots of tasks it makes me happy and I still always have time for myself and my partner of course. I give my partner space and listen to their feelings as well as just being there for them . What am I doing wrong? I always just say if you need something or want something to be different just tell me and I can make it work if my partner says they want tondo something like helo cook or work or anything else I'm cool with it . I'm an easy to please respectful person I hold doors and have manners. I don't know I guess I just want some advice on what I should do after I heal from my breakup? I just am gonna take some time to myself and reflect and do some self improvement . Thanks,