Is it normal to have on/off romantic feelings for your best friend?

This started almost 4 years ago when we were in school, i met him through a friend and there was just an instant connection.
I didnt really like him at first but after a while i developed feelings. I found out he had a girlfriend but they broke up a month after we've been hanging out so much.
So he was a little sad but it wasnt hard for me to cheer him up.
While this happened some of his friends and my friends were telling me that they think he likes me which made me happy :D
so i continued to be myself and wed hangout lots either in groups or just the two of us and wed always we beside each other; people would always ask us if we were dating and hed never say no hed always say Uhh or uhmm so id say No were best friends. Sometimes people would say we look cute together and wed both say thanks.
But yeah after hanging out hed start to say something but then stop or go really quiet and not tell me what he said but i heard, asking me out was what id hear most times. Id get tired of waiting for him so id move on but then hed act all cute with me and win me back every so often.
We went to this party and i dressed up really pretty and i met him at his house and he seen me and his jaw dropped then he said "Oh my god you look so pretty" then that whole night he kept acting like we were a couple and showing me off to people. He usually has a problem with giving people complements, especially me.
I slept over at his house recently and i he was walking me to my busstop like he always does and while we were walking i seen this huge buldge in his pants then he started getting all awkward and pulled a mr.handy pocket then kept talking weird.
He likes to take me shopping with him and he asks me what id like to see him wear and he'll get whatever i pick out for him.
I moved recently and he always texts me saying how he really misses me and none of his other friends are as fun as i am.
We both messaged each other at the same time asking i would move back be roommates.

But this has been going on for a long time and id love to get intimate with him but i wouldnt want to lose our friendship, and i definately dont want to be friends with benefits.
Whenever i look into his eyes i can see something and we act like ere a married couple sonetimes when we go get snacks to watch movies at his house and people smile at us.

Is this normal for this to go on this long?