Re: How far…?
It hurts to see when someone that means a lot to u ignores you. How to approach it is basically depend on ur personality.
If someone I love and care about without any selfishness then I would dare to ask n bring up that why that person is ignoring me. But if that person doesn’t mean anything then I wil take mysweet time and will treat the person same in return 
If you really Love the person, Ill say don’t do the same thing what he/she is doing to u. Do something different so he/she can realize.
p.s and we cafietes are way smarter than what u all think 