[Spoiler] I was very confuse and had to re read it to understand the relationship. I guess it like how some people only like someone because they like someone else. Once that someone likes them back then they lose interest. It works because they are best friends and okay with sharing or being fwb
Damn everyone is so impatient. I think this is actually good and not always good girl meets good guy. I believe she will end up with her childhood friend