MAJOR ex bf VS love of my life... LOVE TRIANGLE!?

I just recently broke up with my boyfriend. He was very sweet and giving, but he also was one of those boys who likes to "smuther" us girls... He would not leave me alone, and I got sick of him. :( Also, I had something else weighing on my shoulders. I have fallen inlove with my best friend, Lee. Now I'm not some stupid girl chasing after a guy who doesn't like her when she already had a boyfriend. Lee does like me. And so does my boyfriend Hayden. Infact, Hayden loves me as he told me several times. The other day, I wrote Hayden a letter. In the letter I explained that I wanted to go back to being friends, mainly because my parents didn't want me dating. He understood and now we're back to being "just friends." Except, he's told me he still loves me. I thought I was clear. I love Lee. I can't tell Hayden though because it would destroy him. He's already stated that he doesn't want any other girls but me, and that he would preferably like to marry me one day. I disagree...And I haven't told Lee I love him yet because that just may over through our friendship completely. Right now, I'm NOBODIES girlfriend. And that is the way it will stay, until this fall when we're all together again. (All our brother's play on the same baseball team, that's how we all met.) The worst part is, we're all best friends. Both Hayden and Lee are friends. Me and Lee are friends. Me and Hayden are friends. See the problem. Some friendships will fail... I know it. It's aweful! But what can I do about it? Hayden is currently unaware that I like Lee, or that Lee likes me. Lee knows that I do not like Hayden anymore, and he knows Hayden still loves me. And I know, that Hayden loves me and Lee likes me. *pants* Yes that a lot... but that's my situation. What should I do? This fall, I'll be clinging to Lee all the time... How will Hayden handle that? He's very touchy, insecure, emotional, etc. Help me...!