Betrayed (movie, 2014)

Julie, six months pregnant, and her boyfriend Trent arrive at a tiny Cape Cod cabin for some time to relax. The town is quiet and deserted during the off season… except for Sully, the creepy guy who’s keeping an eye on the couple from a distance. And then there's Jonathan, Julie’s husband, who she thinks she sees across town. With the divorce still being finalized, he can’t find out that she’s on a romantic retreat with another man...