Then don't fully commit to a relationship. Focus on you-- interests, hobbies, working on changing a habit, supportive friends, work/school/volunteering, a pet you want, whatever. If it feels like you've been doing that for a long time, I'd recommend: a) change things up or, if you're in a sweet spot, do it a little longer (it's a good thing to do), or b) seek support in moving to the next phase of your life.
Sometimes experiences, good or bad, do change the way that we look into the future. That idea of commitment may come back to you after a while. At the same time, not looking for that particular image or idea may end up being a good thing.
It does sound like seeing a good therapist might help. You don't say much about what went on in the relationship, but it might be helpful to have goals that include identifying red flags in potential partners. Not every a*****e has an obvious tell, but most assholes have a few, and it's easy to be blindsided by when you haven't encountered them up close and personal.
Feeling like you've bumped up your a*****e-perception a few points won't solve the problem, but it may make you more confident while you put feelers out for a new relationship. Also, congratulations on getting out of your last relationship. It can be really hard to do.