How to trust in relationships again? Broke up with my [M27] gf [F27] of 7 years. Last year of relationship had some difficult moments.

I broke up wit my [M27] gf [F27] of 7 years, 2 months ago.
The last year of our relationship wasn’t the nicest time we had…
She insulted me in fights (name calling), and behave kind of strange with her phone.
No cheating that I know of, but her behavior with her phone was suspicious in my eyes.
What bothers me is that there was no proof of anything (however there were some deleted messages on her phone…).

I know it’s a good decision that we broke up…but my problem now is how do I ever trust other women after this?
I feel like, if she (normally sweet and nice like an angel) was doing all this after 7 years, then any other women could also do it easily. I feel like dating would be high risk for me.

How do I gain trust in relationships?
I don’t want to generalize and I want to feel like I can date and love again, so please give me any advice. Anything is welcome 🙂

Thanks!

TLDR; how to gain trust in relationships and people after breakup?