Love triangle will inevitably cause hurt feeling

DEAR ABBY: I’m a woman who, a little while ago, got a girlfriend, “Darlene.” After meeting her, I thought that was what love felt like. But my old (bisexual) friend “Michelle” has me feeling differently. I have known her since kindergarten, but recently I feel my heart racing and butterflies in my stomach just thinking about her. When Michelle does my nails and holds my hand to steady them, my knees feel weak. I do not feel this way with Darlene, although I still care deeply about her. I don’t want to hurt her feelings by breaking up with her, but I think that if I were single, Michelle might consider going out with me. Darlene’s feelings are extremely sensitive, and I want to keep her as a friend. But just being around Michelle has me feeling happier than ever. Abby, this is driving me insane. Do I risk hurting someone’s feelings, or should I stay with Darlene and miss out on being with someone I am in love with? Am I a bad girlfriend just by thinking of this? — LOVESTRUCK IN ALASKA