Do you ever contact your ex out of loneliness/boredom?

I've been told that girls do this a lot when they are lonely/bored but why go to an ex and not your friends?

It has been 2 month since I spoke to my ex and she text me recently. I did respond and we texted for a few hours. Since then I have heard nothing so I guess she got her fix. But why do it?

I usually feel worse after speaking to an ex as it makes me miss them but for some reason it seems to be the other way round for girls?
Do you ever contact your ex out of loneliness/boredom?
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