Is it normal to always talk about relationship with your friend?

I started to notice that, everytime there is just 2 of us, it must be topic about relationship. Well it didn't go in detail as personal, but just the topic regarding it. Always, all the time. As if there is nearly no any other topic. Why is that? Even if we started about food, or game, or about life style, then at the end, it will be back to relationship again.

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Im talking about opposite gender friend..
Is it normal to always talk about relationship with your friend?
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