Do our feelings disappear?

When you had something with someone and your ways separate for some other reason (I mean, you didn't argued or anything) do your feelings disappear completely? For sure they get weaker but if then after some months you see that person do they come back?

Me and this guy had a short story together, for a little while we were really close, we were like best friends and couple in one but then we moved away and just lost contact... For me it's still difficult but he seems to not care about it. Do you think his feelings disappeared or they're still somewhere there but he just decided to cover them?
Do our feelings disappear?
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