Unfortunately, to get through Parts 1 & 2 of the game, you have to cater to both of them. You have to balance their affections for you to get out of the loop to arrive at Part 3 of the game where you can reach a happy ending with Vincent.
Ugh. That's a pain.
My mind is not created to focus on more than one person at the time... >_>I very much have a tunnel-vision when it comes to love.
You could use the cheat codes to jump to Part 3 or later, if you'd like to get to the endings easier.
That'd be worth a shot I guess. I'd love to see a happy ending with my favorite....without catering to people I don't like.
Thanks.