Clark asking Lex why he tried so hard to save the friendship and Lex basically saying that he just wanted to have Clarks life as in loving parents, beautiful girlfriend and so on.
Like this was not the vibe I got from the last 5 seasons?! I can totally see that Lex wanted to have the loving family and everything, too, not only on a meta level but for real, and that he really was envious. Maybe he even realised it and just never said it.
But reducing this friendship to just envy leaves out the whole theme of trust and truth in the series. It leaves out Clark wanting to tell people his secret and Lex's fascination and later obsession with Clark. It leaves out "We have a future, Clark." and "Your friendship helps keep it at bay." and "I saved you didn’t I? That turned out alright.". It leaves out the jokes between them, the glances, the hugs. It leaves out Clark saving Lex and Lex helping Clark countless times.
This was never just envy.