Could anyone enlighten me why after Angel had become human again in Angel:After the fall, he didn't try to get together with Buffy??

i think he did and then he realized that buffy ou him might die because he had no strength against demons and rewinded time

Far as I understand it... the senior partners turned Angel into a human to weaken him when L.A was cast into hell. (Which explains why he can't just go rushing into her arms in all effect because his in *hell*) But later doesn't remain human when it returns to normal. I don't know why (Probably because balance was restored again ou something), I haven't really read it. Just here and there.

After L.A. came back to earth, he became vampire again. Then became Buffy's "enemy".

when Angel became human he faced a demon without buffy n failed to eliminate him he realize if he get back with buffy he will put her life in danger n burden to her as she is a slayer so he decided to stay away from her
for me this is the most cœur, coeur breaking moment on tv

Angel might not want to reapet what happen the last time he became human

He was in Hell is the biggest reason, but I think Angel is waiting for Buffy to say she's ready, He can't be the one to make the first déplacer it has to be her, because she has to decide she's done baking.