Ask Tina: My boyfriend chats up other women but says there is nothing to it... should I be worried?

Hi Tina, I'm really quite angry but sad at the same time and don't know how to remedy my situation. My boyfriend, for the past four years, has chatted up my friends all the time and, although he says I'm being a pain, that I'm completely overreacting, that he's just having a bit of fun […]