Yeah I get that. I used to think "I literally just want someone who's nice to me, and who treats me with respect, is that really so much to ask for?"
There's a reason people talk so much about boundaries regarding relationships. Boundaries are very important, they define the whole relationship. The first person I met after I left my abusive ex treated me like shit. It was the same pattern. Intensely amazing at first, but after a couple of months he started to be disrespectful. Due to old habits I let a few things slide, but then I had a sort of eureka moment when I realised the pattern was repeating, and I ended things. I ended things MUCH sooner than I would have in the past, and I was so proud of myself for that. I used to have the worst boundaries, I really let people walk all over me. If I could learn to walk away at the first signs of disrespect, I truly believe anyone can. Doing the freedom programme and reading literature about abusive relationships will equip you with the tools to do this too.
I'm single currently, partly because I'm focusing on furthering my education but also because I simply enjoy being single (another massive 180 for me as I used to be someone who was so desperate to be loved). However I have met some nice guys since, who were nice to me and treated me with respect, who even handled conflict in a rational, respectful manner. Those guys do exist.
The best way to meet a nice guy is to learn to walk away from the bad ones, which you've already proved you're capable of. Obviously meeting someone isn't an immediate priority for you, but there's no reason you can't find love in the future.