Ex-situationship has feelings for me?

So I don’t know what to do? Prior to all of this there already rumors going around that he liked me and was thinking about asking me out. Then I told him I like him and we started hooking up. Now the duration of all of this he never admitted to me or express he has feelings for me. He then got into another relationship completely stopped talking to each other. (We we’re coworkers) I decided to work at another location. Everyone who I told this to, says he still has interest in me. It didn’t mattered if the girlfriend as around, he would find ways to be around me all the time and that was at work. He could come on his days off. Multiple times a week or even throughout the day. He recently DM on social mainly tik-tok and started teasing each other how much we missed him each other (one time thing). I just feel sorry for the girlfriend. I feel like she’s a placeholder for him. But he’s wasting her time? But I’m torn if I should confront him about it?
Ex-situationship has feelings for me?
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