My brother says really hurtful things to me all the time, as in, if anybody else said them I'd be pissed off, if not hurt - but for whatever reason, when my brother says it, I don't get offended. Insane

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I'm not sure about romantic love. I do think it's a real thing, I think it's a combination of obsession and respect, or at least it should be. I mean, if you don't care about the person you're with, you're not in love - or if at one time you did but no longer do, then you're no longer in love. Similarly if you don't respect and admire the person you're with, then you're somewhat intolerant towards them, so you're not in love. I think lots of people are then guilty of holding on to something because they used to have those feelings towards their partner and somehow hope it'll return?