Subtle definition of 喜欢 喜欢她就主动一点儿， 机会是不回自己跑到你面前的。

I ran into such sentence and had trouble understanding 喜欢她就主动一点儿。

Does this mean, I would prefer she acts more proactively?
One correction from the original sentence: 


  喜欢她就主动一点儿， 机会是不 会 自己跑到你面前的。


It means: if you like her, you should be proactive / take initiatives, since chances wouldn't run for you automatically(implying she wouldn't call you first). 

The sentence can be paraphrased as: 如果你喜欢她，你就主动一点儿， 机会是不会自己跑到你面前的。