I fell in love with my boyfriends best friend help need advice (read more)?

about three months ago i realized i had more than just friendly affection for my guy friend. He's a great guy he has been with me through hard times and never asked for a thing in return. when family members died or my heart got crushed he had his arms around me ,but the catch ever since Ive known him he has had the same girlfriend. The issue is we are both taken. Ive been with my boyfriend for a year an hes been with his girlfriend for about the same length of time. One day he admitted to me that he thought i was gorgeous and that he sometimes couldn't take his eyes off me. After a few hours of testing we preceded to send sexual text messages. after though he called an said he didn't feel guilty because it felt right being with me. From then on we were acting like a couple with out hanging out in person. we kept it strictly phone afraid we;d both end up cheating if we hung out alone. he told me how he was dying to kiss me and simply just hug me. after a week or so of doing this via phone he flipped out an said he felt guilty and he had no feelings for me. He said he loved me to death but not in love with me an he never was. He has a way of lying to protect me. i called an said that he was lying and he hesitated an all he said was we can't do this i dint want your boyfriend or my girlfriend to find out i would die if i hurt them. then the next day we ended up in a sexual situation after i said i felt so used that we had sexual enc outers while his girlfriend got the relationship talk an told how he adored her. he felt so guilty he almost cried. now he says we cant ever bring it up but i know he loves me too hes scared so hes denying it. He is the greatest guy ever. i love my boyfriend though it doesn't sound like it but I'm torn in two i am different around each of them. i just want to know what to do my boyfriend is great to me ,but my guy friend has always treated me like im the most beautiful thing he's ever seen. he's a virgin an only ever had one serious girlfriend, the one he is with. I miss him. he says nothing will change we'll be friends who made a mistake,but it wasn't a mistake. Mistakes feel wrong and i know he wants me too. what do i do? i just want to know who to be with an if its my friend how do i get him. how do i get a taken guy to admit he wants me and come after me???

what an unfortunate situation. thing is .. if the both of you we rent emotionally cheating on your significant others you wouldn't feel the way you do. he would still be just a friend, you would still have your best friend and you wouldn't be in a mess.
obviously neither of you respect the people you are ACTUALLY WITH so my advice would be end the relationship with your boyfriend. not for the other guy but for your boyfriends sake since its quite obvious you dint care enough about him to respect the relationship your in.