Well for me its working And he is a lot for me Gn if u want it to continue u should believe and make ur brain believe in one thing "he/she can't be a bf/gf for me" but at the same time u can believe "he/she is my everything and I won't leave his or her side and she won't and we will share our life moments for each other" And don't flirt too much , because over flirting(the flirting that crosses the joking limit) will cause u to make either urself or ur bestfriend to feel feelings towards u more than a best friendship. Thats an advice by my side