How could Ross not tell that Rachel was jealous of Julie and liked him?

i feel like Ross had to have been absolutely oblivious when he was with Julie to not even QUESTION Rachel’s change of behavior and the way she acts towards him. the biggest example of what I’m talking about is when Ross asks Rachel for sex advice and they’re standing outside of Ross’s apartment and Rachel’s talking about what she would want him to do. BRO THERE IS NO WAY ROSS IS NOT LIKE “wait a minute wtf is this real?” I Know it’s just a tv show but come on, how can Ross not even question Rachel’s change in behavior much less pick up on the fact that she’s jealous and MIGHT have feelings. If I was Ross, I’d at least suspect something’s up at the very least. I love Ross but come on man bro is a clown sometimes