He’s got a new girl, why is he still chatting to me?

So i dated this boy 9 months ago and although we got along well it just didn’t work out between us because it wasn’t going anywhere as we both had a fear of commitment. We agreed to stay friends and he told me he had already met someone. I was fine with that as i was already over him at that point. We still talked everyday and i slowly tried to stop the contact as i felt that was the normal thing to do. However, he would double text me and send me another message asking why i was ignoring him.

Carried on talking almost everyday and now we go a couple of days without chatting but still start a conversation every now and then, sometimes updating eachother of our lives. He still makes flirty jokes which i don’t know whether to take seriously. I now have met someone and we’re pretty serious. I told him this and he was pretty upset. About two weeks ago we had a conversation where he said that he wished we tried harder, that there were a lot of wasted potential and that i was too good for him. I’ve seen the new girl he’s chatting to and she’s absolutely gorgeous and they seem really happy together.

I want to bring up that we should stop talking because it’s not fair on our partners + him bringing up the past is hard. He was the first boy i ever dated so i still care about him a lot as i was there for a lot of things that happened in his life. Does he have an ulterior motive, or does he just not want me to move on?
He’s got a new girl, why is he still chatting to me?
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