I have boyfriend but like another guy, please help me?

I have boyfriend but I have a big crush on another guy. I love my boyfriend and since we have been together for 2 years we developed a big connection. There is this other guy I have a crush but I am not sure if he likes me back because his vibe with me is similar to the vibe he gives other girls. It's killing me to know if he likes me or not. One day he is super flirty with me and makes me feel good and another day he is aloof and I dont know what to think.
I don't know if he likes me and maybe is scared to make a move because i have a boyfriend or doesn't like me.
How can i get him to make a move or how do i find out if he likes me?
I have boyfriend but like another guy, please help me?
Post Opinion