Questions on Love

Why is it that we always end up the ones to pursue love? Why would we fight for someone who needs to be pursued? If things don't flow, they are not meant to be. If we have to work on it, then something isn't right. But there, on the other side, your heart is telling you it is actually right. It feels right - makes you smile, hurts you, etc.
I can't help but wonder - if you fight for someone, doesn't that mean that you walk against nature? Doesn't that mean that you are pushing someone towards something they don't know whether they want it? And then, if you just stand there and wait for them to come to you, wouldn't you feel like you don't love them enough? If fighting means disrespecting the other person' wishes, and waiting means a lack of strong emotions, what is there to be done?