Most Helpful Guy
Most Helpful Girl
Okay so two things.
1. It sounds like this guy is using you as a rebound. I don't think anyone can like 2 people the same way - he likes someone more.
2. He needs time to get over that girl before he jumps in with another.
I would tell him straight up -"Its clear that you still like that other girl, I like you but I don't wanna be your second choice. When your over her, let me know."