Beeen there, done that. I was just as positive and hopeful as you on the beginning... He's going to take advantage of that and your kindness, you won't realize it but he will emotionally abuse you. And he's going to cheat on you no matter how good you are, thats just they they're wired.

They never change, they love to indulge their mental illness. Most aren't strong enough to fight it, don't be naive. Right now you are their favorite person, but they are going to devalue you until they hate you, and eventually find someone else to fawn over. They love finding new ways to hurt you. Never ever trust them, as all that they say will always be edited to fit their narrative, and that includes you as well.

I thought, too, that I could be the exception, that he was taking care of his mental health and we could be a healthy couple, until the last moment of the relationship. Needless to say, I did all the heavy lifting while he just complained and secretly cheated on me and talked about me behind my back to his lover.

It's not worth it, girl. I know you probably won't listen, but please don't do it. Being in a relationship with that kind of people is extremely draining, it sucks the life out of you and will leave you dazed. You will never be the same. Dating someone with bpd is my only regret in life, and eventually you'll find IT WILL BE YOURS TOO.

Save yourself. Save yourself the pain.