After being stuck in a timeline with him for 7 years, you'd grown to slightly like him. It wasn't too much of an overpowering crush that it'd distract you from trying to get back home, so you spent a decent amount of time trying to find a timeline where you could rest until you found a way home. This meant you two spent a lot of time together, and after finally finding a timeline to rest in, you started to be more open with each other.

"You know, you may not be as bad as I thought you'd be, but you're still kinda bad." Five states honestly. He never hesitated with being honest, which is sort of why he's annoying, but sort of why you like him.