Please Advise: I Love my Best Friend More Than My Girlfriend

There is this beautiful girl that has been my bestfriend for  more than 4 years, we trust each other a lot and we don't hide anything about our personal lives from each other even our relationships issues like she knows alot about my girlfriend and i alot about her boyfriends , i am comfortable to say that i know her inside and out.

We can do anything while together she can even srip nak3d infront of me, but our relationship does not alow us to have s3x. We decided that the only way we can stay friendz is to avoid a sexual relationship and since we love and respect each other we make sure to avoid s3x.

We dont have intercourse but we touch each othe, she even allows me to play with her t.i.ts and herpapuchi and every other parts of her body, she does the same with me but no s3x.

I want this to end i need to be with her but am afraid if i tell her she might leave my life forever,

Nifanyeje?