Should I ignore my thoughts about my ex or do they mean something?

I miss him. I broke it off months ago and I have a new boyfriemd but I constantly find my self wanting to say his name. I think about how he would treat me vs how my current does. Reminese on what happened. I think about how things would be right now if we were still together. A month ago My friend said he cried after seeing me face to face since the break up. Supposedly he still had feelings but he hasnt talked to me in months. He was mad that I was showing off my new boyfriend a couple weeks ago.