What was the reason why I had bad experiences with some previous boyfriends but a good experience with one guy?

I had started talking to one guy in real life and did say my name and did say his name back to me. Didn't talk that much. I didn't have much time. I did say see ya and did the same back. It was a good experience. My experience with some previous exbfs were bad experiences , some exbfs did cheat on me and the last exbf was turned out to be toxic. Most of my previous did all ended. i'm can only date or be in a relationship with moderate learning disabilities. I know not all guys are the same. Some guys can be bad and some guys can be real good. I just had bad luck with some previous relationships. What was the reason why I had bad experiences with some previous boyfriends but a good experience with one guy?

What was the reason why I had bad experiences with some previous boyfriends but a good experience with one guy?
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