Why do I trust my current girlfriend more than my ex?

I can't explain why I'm so confident that my current girlfriend would never cheat on me or would never leave me, while I was always anxious that my ex would cheat on me or would dump me. She was not untrustworthy per se, but I even broke up with her because I couldn't trust her. When my current girlfriend does the same things (texting another guy, going out with another guy), I feel secure.

Why do I trust my current girlfriend more than my ex?
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