He came to where we used to hang out with his new girlfriend

Is he trying to hurt you?

Of course not.

This happens a lot with breakup situations.

Yes! You might bump into him.

It doesn't mean he wants purposefully you to see him with another woman.

It simply means that he does go out and happens to be with someone else.

Don't make much of it. This is not a retaliation strategy or a desire to be cruel with you.