Just Got Out of a Long-Term Relationship and Can't Stop Fantasizing About Strangers in Public

I recently ended a seven-year relationship and am struggling to reconcile my newfound freedom with the intense fantasies that have started cropping up. Tonight, as I was walking home from work, the sight of a stranger's firm buttocks in tight jeans triggered an overwhelming desire inside me. I found myself envisioning him turning around, those same jeans sliding down over his thick, muscular thighs and revealing every detail, the curve of his hip bones, the dark curls at the base of his spine. My fingers clenched into fists as I imagined my hand tracing along the outline of his shaft through his pants before he guided me towards a secluded spot to pull off each other’s clothes with eager hands. Is it normal for these vivid fantasies about random strangers to consume you this much so soon after a long-term relationship ends? Should I try to suppress them, or are they part of my healing process?