What is my boyfriend left me for his ex?

I'm sorry to hear that your boyfriend left you for his ex. It's important to remember that relationships are complex and each person has their own reasons for their actions.

Here are a few possible explanations for why he may have left you for his ex:

1. He realized that he still had feelings for his ex and wanted to give their relationship another chance.

2. He may have felt guilty or conflicted about the breakup with his ex and thought that getting back together was the right thing to do.

3. He may have felt that his ex was the "safer" option, or that being with her was more comfortable or familiar.

Regardless of the reasons behind the breakup, it's important to take care of yourself and allow yourself time to heal. Don't hesitate to reach out to friends or family for support, and consider seeking professional help if you're struggling to cope. Remember that you deserve someone who is fully committed to you and your relationship, and that you will find happiness again in time.