i know i would be jealous of a copy of me if he got to spend 12 more years with the people i loved before getting the girl i'd been in love with for ~7 years.
also, i wonder why yancy still named his son phillip if phillip was around when his kid was born? they didn't seem to be much different, they still goofed around like they did when they were kids, and yancy was still jealous of his seven-leaf clover.
Yes, Fry was jealous of Lars. Look at the way he acted, and he even went back to the past to become Lars.
iirc, he didn't go back to the past to become lars - he went back to the past and discovered that he was lars.
"Lars" Was the Fry who decided not to use the time code for the pizza, he didn't know that it would create the paradox that caused "lars" to exist, but then again Fry doesn't really tend to think ahead.
The fact that he found out he was lars and froze himself to get Leela indicates just how selfish and childish even the so called more intelligent "Lars" really was, to hell with the version of my self I left in the future, I want it, She's mine...., at least until he learns that he as a time code cloned paradox duplicate was doomed decides that Leela didn't deserve that heartache and decides to call off the wedding.
I don't really care for BBS, and Lars just irritates me, he wasn't smarter or better than Fry in any way, other than his "name" wasn't Fry, and Leela being fully in character and being overly quick to jump after any one who seemed to pay her any favorable attention, so long as it wasn't from Philip J Fry. Alkazar, Adlai, Chaz-The Mayor's aide, Lars was just another in a long line of men who act like they were actually interested in her for who she is, rather than what they really wanted, ie to use her to get to their own ends.