I miss him so much
Me and my best friend spent all day yesterday at school together, generally sitting with each other, and whenever I am not with him I miss him so much, to the point where it physically hurts in my chest. We are both guys and I am - shall we say - sexually attracted to women but I have never felt so much longing for them as I do for him. I do not feel sexually attracted to him.
This all really started after a school residential where we all started hugging one another. As an aside, he might be gay.