<human>: Things ended with my ex a little over a month ago. We had been living together and while things had been going downhill for a few months, we were still intimate to the day I moved out. So I still felt strong feelings for him. They've faded slowly and I started dating just a couple weeks after we parted and now I'm with a really awesome guy who I think could be serious. But I still think about my ex fairly often. I don't wish I could be with him instead, but I miss him and even fantasize about him sometimes. Is this something I should bring up with my partner? Or my ex? Or is it just a feeling that will fade with time?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I'm really happy in my new relationship, but I still think about my ex and don't know what this means for me.