Fiance issue

The other night my fiance was sleep talking and he kept saying his ex's name. I pointed it out to him and he said he hasn't thought about her in two months, we've been together for 3 years and he says he misses her. Well next weekend he is going to his hometown( which is where she lives) for opening weekend for deer season. We are suppose to get married in a few months. Should I tell him to go see her? I don't want to marry him if he still has feelings for her. I know he does but are they enough to act on? Advice and help please