Meaning of a dream where me and my fiance are being chased?

my fiance keeps having this reoccurring dream that he and myself are in someones backyard where we go to the woods right at the beginning of it. We have 2 people with us every time and there is a lightning storm. He says that i always mention to him that there is a man in the woods with a pinstripe jacket or sometimes its pants. The man never reaches us but he says he is overwhelmed with fear and my fiance grabs me and runs back into the house and the dream ends. He has been having this dream every night for the past 3 weeks. Any suggestions about what it could mean??