I am in my second marriage after a very very long relationship (15 years) which was emotionally abusive. He was a selfish, commitment phobic, cheating, lying man, and it just escalated and escalated. The first to few years he was charming, then very slowly it unravelled. We only ever married because after a decade I left, and he wheedled me back with a proposal and promises. We did marry, but that was pretty much ruined as even the night before he whispered to me in a room full of guests that he was fairly sure he wanted to get married but not sure to me. Why I didn't just walk away I will never know, I was very weak from years of being put second and in some strange way didn't understand what proper love felt like and thought that was it. It most certainly wasn't! In the end after multiple affairs in our marriage he was diagnosed as a sociopath. Not a surprise as the end, the the journey was long and it didn't happen overnight. Maybe more extreme than you, but you get the idea.
Now I am married to a man with a 'normal' views of life and behaviours and it is a world apart. I don't constantly have to think about emotional things, or analyse behaviour, or wonder what is coming next. That stuff (although you don't always realise it at the time) is frankly exhausting. You turn yourself inside out so much for such selfish people, and spend so much time thinking about them and their stuff, that you don't give enough headspace to you. The whole thing becomes skewed then you run the risk of becoming emotionally dependent as well, and it's just wrong on every level.
I don't HAVE to work massively hard at my marriage now, it just works. We fit like two pieces, not like something which takes energy and effort. There are no games, no battles, no strategies, no adrenaline ups and downs, no panics, no tears and we work as a team, aiming for the same things. And best of all I don't have to think about any of that stuff either. My brain felt so free, it kind of emptied of all that rubbish. I can think about good stuff instead. Real love doesn't hurt, it just feels comforting like a blanket. I don't get fireworks when he walks in the room, but I love him like no one else and always will, and I know he feels the same.
Are you married? How long have you been together?