We’re talking and he still passes to his ex almost everyday?

there's this guy we work at the same place he’s 28 he have been talking with me for a while now and i like him so we have been talking but his ex works in the shop that’s beside us he almost everyday passes there even i was with him he was with here for almost 6 years and he says that they agreed that they’re just friends but I don’t think there’s friendship between 2 who used to date why does he do that
We’re talking and he still passes to his ex almost everyday?
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