I'm in a love triangle with my two best friends, but...?

Okay so, my and my best friend john both like Martha. Martha and John met through me. John felt really guilty about liking the same girl I did. And tonight, it was John who said "dude, if Martha is making you do these things, you're in love with her." And he's right, I'm in love with her! He's the one who made ME realize it! He had felt so guilty about liking Martha that he was going to back down. But, she STOPPED him from doing it. She stopped him because she said she would still like him if he did. But after learning that I'm in love with her, why didn't he voluntarily step down?