Hate to do this dearheart but it's been made clear from day 1 there were only 4 love interests.
It's always been Selena, Anna, Jane and Lisa.
Emma is getting an ending based on popularity votes, Nicole is still a maybe but the rest were side girls from the start.
Jade doesn't have a solo route because she gets with Lisa unless you are on Lisa's solo route.
Not really.
If you try dating more than 1 girl they all break up with him so it would require someone to make a whole route to bypass the cheating and then try and make an ending which would be pretty much like making a new game.
That's also the reason no one has modded in an incest route.