saying i love you in BLs

yk what I've noticed for a long time in yaois, is that in a stories characters never really say i love you, well they do but when its like one person saying it first n then the other goes to say "me too" like why is that. i feel like its rare too see like i love you being said in a proper way rather than saying me too n stuff. like does anyone get what im saying (ᗒᗣᗕ)՞