A relationship of convenience with someone you don't love?

Anonymous
I dated a guy at college and am a year older than him. We stayed in lots of contact, both of us were in touch with each other every day at least. I knew he was seeing another girl up there but he told all his friends she meant nothing to him, it was mainly a sex thing. I only met her once and he wasn't into her. still texting not just flirtatious messages but really sweet ones, only for someone to tell me they were now a proper item.

I'm confused why they're together when he always said to his guys that he wasn't interested. I don't know why he still tried so hard to stay in touch with me if he was with her. we don't live in the same area now but they live around the same city. do you think that this sounds like a relationship of convenience?
Updates
+1 y
the other thing is I told him I don't think we should talk no more now he's with her properly and I know it. do you think this is a good move, give him time, or do you think I should keep in contact?
A relationship of convenience with someone you don't love?
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