My Dark Secret at the Gym

I’m ashamed to admit this about myself, but lately I’ve been lusting after one of my clients. She’s in her early thirties and has a perfect body, toned muscles from weight training, lean but curvy. We’re both straight, but there’s something about how she moves that sets me off every time we train together. Last night, while she was doing pull-ups on the bar, I couldn’t help myself, I grabbed her legs as she came down and kissed her neck hungrily. She froze in surprise for a second before pushing me away gently. I’m so torn up about this now. Should I keep my distance or talk to her about it? Is this just an unhealthy obsession that’ll pass with time?