My girlfriend will not stop talking to two of her ex boyfriends. We have been together for almost three years and I just found out that she still talks to them,IM's them and hangs out with them. She does not feel the need to tell me when she is engaging in the above captioned activities. She claims that they are only friends. One guy is on his second marriage(they had a relationship on and off for four years)and the other guy is single (they had a relationship for three years). She said she knew them before she knew me so she's not going to stop talking to them or hanging out with them. I have plenty of ex girlfriends that I get along with. I have disclosed to my ex girlfriends that I am in a relationship so it's not a good idea not to talk to them or hang out with them because I don't want to hurt her feelings. Is this normal behavior or is this a red flag? This is driving me nuts.