Like Chris, Leo didn't trust Cole or Christy that much either. One, he didn't know Christy and she seemed hot headed. Two, Cole had a dark side to contend with that could betray him at any time. And he wouldn't let him hurt Phoebe again.
"I know Chris. Believe me I know. But love is anything but easy. If it was easy, it wouldn't be appreciated when you find it." He gave a wry smile. No, he and Piper weren't suppose to be in love. But sometimes, love transcended things. "Sometimes you can't help who you fall in love with. I never intended to fall for Piper. I knew it was forbidden but I couldn't stop myself. It can just happen when you least expect it."