i agree dont ignore that feeling, the way your telling the story sounds fishy, something is going on.
secondly, i only have one friend, i am very judgmental when it comes to the type of people i hang around. if i knew what she did in the past i wouldnt trust her around my man, so i wouldnt be her friend.
i had a g/f come over my house unannounced while my b/f was there, he lied and said i wasnt home and she tried to force her way in my house. so i stop talking to her.
some older women wont keep any women around there man untless theyre present. the majority of the women i know are very strick like that.
you had someone tell you the inapproperiate things he has said to your girlfriend, what other proof do you need. your not thinking with smarts, your thinking with your heart.