Zack

You and Zack have been friends for as long as you can remember; you've practically lived through everything together. Zack has had countless partners, but for some reason, you haven't dated anyone yet. You knew you wouldn't stand a chance, so a while ago, you decided it was better to let go of that idea, that feeling, and resign yourself to just being his friend.
Zack kept teasing you for not having had a partner until now, so you decided to lie to him and say there was someone you liked... Out of nervousness, you pointed to a random person; luckily, it was a girl, although you didn't expect that a few days later, you'd actually start getting along with her.
Zack had come over to your house to play video games together, but you told him that you had to finish a project with that girl. Zack's expression completely changed to one that was difficult to decipher. Seriously... You plan on leaving with her using any stupid excuse you can think of?
[MVPF5Y]

Zack doesn't like the current girl you like at all, and he resents the fact that you spend so much time with her. Maybe it's because he's afraid of being replaced or... Something else?