<human>: Give me the gist of the text in a nutshell

I used to be in a relationship that, in hindsight, was very abusive -- she would deliberately manipulate and gaslight me into blaming myself as the source of all problems in the relationship while she ran around with other men. This went on for years, and was the most significant relationship I'd ever had in my life.

Now, I'm in a new relationship after concentrating on myself for several years since ending the abusive one. Despite that, I am having trouble believing this new relationship isn't a similar manipulation; my guard remains constantly up and it is actively preventing us from moving forward.

Reddit, help. Has anyone had experience in this type of problem? What did you do? Can I have a suggestion on how to begin shedding this suspicion?
<bot>: Taking the suspicion learned from an abusive relationship into a new, better one. Don't know how to move past it.