Is he really gay or are boys normally like that?

Well I've known this friend for nearly 3 years now, the both of us are boys. I kind of fell for him the moment I saw him. We treat each other like best friends and hangout every day after school. There was once we went to have desserts together and he just randomly put an half eaten strawberry in front of me.
I was like, What?.
He said : I've eaten the other half. Eat it.

There are a lot of other times where he insists that he feeds me and I share my food with him and vice versa. I don't mind him doing it, but I can't seem to see if it is an apparent factor that he is gay or not.
We would chat on the phone for 2-3 hours straight at night, there was once where I left after hanging out with him and he immediately called me to chat while I was preparing to shower and I told him to wait until I'm done. I finished showering and decided to call him back but he wouldn't pick up and even ignored me for half a day.

He gets really possessive of me too. I remember the both of us hanging out with another female friend of mine, he went to the toilet and I decided to follow her to hunt for a book she was looking for. He came back and the situation apparently seemed like I was sticking to her like I liked her. He started giving me the silent treatment the whole day. I resorted to grabbing his hand and pulling him aside. I told him not to do this to me, it wasn't what it looked like. He seemed to like it when I hold his hand and even twined our fingers together.

Why I'm still unsure about his sexuality is the fact that he had an ex girlfriend before, even though he spent more time with me instead.

I am really confused about what he is feeling and I don't dare to question him, I am afraid that he might stop being friends with me.

Do you guys think this is a normal behavior for a straight boy?