SO TRUE!-Some people are so blind. One sided relationships are way too common. And what sucks is that person won't realize it until they have lost a friend. If they even care, which they don't, or they wouldn't have let this happen in the first place.
The pain will change, hopefully become less raw with time and in distance allow perspective impossible now. For now, care for yourself, those around you and be as kind and patient as you can. This is the best life advice I have to give.