Time and distance. I think that's the only way. One thing I've noticed over my years on PC (I've been here longer than my profile suggests) is that people do lose the intensity of feelings for ex Ts over time. For me it took about 18 months to no longer miss him or feel love for him. It differs but I don't think I've seen anyone on here still longing for a T they saw longer ago than say, 2 years or so.