i’m too emotionally invested

i 22f have been in a “friendship” with 28m. we met through work and it started off with intimacy. for the past year and a half we’ve spent a majority of the time working and talking with each other via online. this relationship has led to nothing intimately stopped completely and one thing happened in december since then there’s been nothing. i’m a position where i’m fully confused. how could one not truly want to develop a relationship with someone and continue to talk to them constantly. it’s taking a toll on me i’ve been deeply insecure but can’t find a way out. i physic myself out of leaving constantly. many people i’ve talked to have said it seems like a pity him. i don’t see it that way i’ve helped him in many aspects of his life but it seems he doesn’t truly care.
tl;dr i’ve been stuck in a loop for so long in a window of friends and maybe more for so long i cant bring myself to leave. i’m too emotionally invested