Movie stuck in my head. help!!!!

Please help. I've been stuck thinking about a movie for about 20 to 30 years and all I remember is the ending so spoilers ahead.

All I remember is that a girl goes missing and either the boyfriend or friend starts to get blamed but at the end I think he senses her and she turns up alive stranded on a rock in the water. I think it took place in some small town. Please help I can't take it anymore