If you have negative feelings about a woman enjoying sex, you talk to your therapist about your feelings. You don't fucking slutshame a woman no matter how you are feeling.

Honestly Dusty doesn't have to keep dating her if he doesn't want to for whatever reason he has, but he should keep this reason to himself. He really should have dealt with his feelings on his own, but if he needed space then he should have the awareness to make something up and not dump his sexual hangups onto Harper like it's her fault for enjoying sex. Women get enough shit every day for having a normal healthy sexuality that they don't need to take more of it from people they trust.