How is anybody ever supposed to find a partner if it's usually one sided?

I always see that most relationships are one sided. there's always one person in the relationship that did more of the chasing and that loves the other more, whereas the other person isn't AS interested & may even have interest in someone else who they want to chase but they're interested in someone else. It always just seems to be a chain. is it rare for a couple to both love each other equally?

I've also always noticed that a guy always chases a girl so much more when she's no longer interested, or when she never was interested in the first place. It's always the girls that are super unavailable that men seem to so badly want and chase so actively, whereas the ones that are available and actually want a guy will never be chased by the guy they want. Why is it always so complicated? if it's always one person that does all the chasing when the other isn't even interested, what good is gonna come out of that? does it even balance out in the end? does the girl being chased eventually want the guy or what? are we supposed to settle for the ones chasing us even if we don't want them? are we supposed to just forget about the ones we actually want?
How is anybody ever supposed to find a partner if it's usually one sided?
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