I fell in love with my best friend. help.

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So, last year the mother of my children and I fell out and broke up/separated (around march 2016) etc. My best friend (we will call her "J")and I met about late 2015. She was there for me completely through my hardest time. Would check up on me. Make sure I was okay, threw me a bday party so "you'd remember people still love you for who you are" (my ex left me in fucked up circumstances.) But around Halloween 2016 or so we just clicked and started talking more often etc. NOW, she has a boyfriend so let's keep this in mind. But, every time we go to a party or hang out we become closer. About march or so of 2017 I told her I love her as a human and she told me I'm her favorite person in the world. Not much later we started talking everyday and are really just innocently friends. But since about late June I've started getting feelings for her... And so I just keep my mouth shut because she is a perfect friend. Well her bf one day shows me his penis and asked me if I'm in love with her (we were drunk) I told him yes because it's true. I'm a very honest person so he replied "well I trust you regardless." This was early july, apparently he accused her of fucking me two days later. Since then we both talked to him and things seemed to calm down. Since late July our conversations are slowly drifting. I'll realize we are being lovey or too romantic with each other. We went on a trip together in july (over 12 hour drive) and I thought this would humanize her and thus I'd feel less romantic for her. Not at all what happened. We got stuck in the rain, got along the whole time and when I laid down she pulled over and laid down in the back with me. Since that trip she is a lot more affectionate and in the last like 2-3 weeks we have even turned to moments where I realize we are being too sexual with each other both via text and talking. IDK what to do /adv. I love her very dearly as a friend, don't wanna hurt her bf, not sure if want to be with her. Continued;