He was funny in the early seasons, he developed into a sniveling, lying little shit. Cryer's acting made me hate the character, which is a sign of incredible talent. To this day I despise Alan Harper. To this day I admire Jon Cryer.
He's still in love with her. In the series finale, he called Judith and says that despite what had happened to them, she is still the love of his life.
Jealous of her? Who bullies him with her lawyer whenever he disputes paying some sort of frivolous bill she gives him as if he's her personal walking ATM? Only one word explains that: writers.