Boyfriend and ex sleep over ?

Hey Guys So My boyfriend said that he would be visiting with a friend to see his ex girlfriend because they are friends she lives 4 hours away and mentioned that because the drive is so long it's possible he will sleep over for a day or two now ladies would you feel comfortable allowing your man to sleep over an ex girlfriends house? they were high school sweethearts but are just strictly friends he also wouldn't be going alone he's also going along with  another female friend from high school iam very interested to hear many of your views about this topic what would ya do and how would you approach this ?   How would ya feel ?