When do you know that you need a break in your relationship? Do people do it to have sex with others or to currently fix their own problems?

poneglyphs
I heard and of both situations and just made me wonder? Do most people do it because they are bored and want to have sex with other people? Also, do breaks ever lead them to getting back together again or just separates them? My friend went through a break but he did it because he felt like he needed space? He's back with his ex I guess in this situation and they act like nothing happened but they still look like they love eachother?
When do you know that you need a break in your relationship? Do people do it to have sex with others or to currently fix their own problems?
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