Work on being better for the next one so they don't do it.

You can go two ways

1. Lie to yourself and say "she wasn't worth my time"

2. Be honest and say "I wasn't good enough"

People love to support your lies. They'll say "She wasn't good" or "She wasn't worth it" but in reality she was the one who went looking for more, not you. They're just hurting you.

Take this time for evaluation of who you are, what you did, and how you can be better.

Also take this time to understand who you should be with. Everyone has deficiencies and you need to understand yours and know how they'll change a relationship.

No one leaves because the person is good, they leave because they're failing them somewhere. Find out where you were failing and fix it going forward.

Good luck