Here's the letter....have any advice? Email it to jackie@1003thepeak.com

Dear Donnie,

  I've been dating this guy for a few weeks. We've known each other for a couple years, so it's wasn't like he was a stranger. Every date has been amazing!! We have great chemistry, and he texts me all the time. We are really into each other, or i thought we were. My brother told me he's seeing someone else, not serious, but he's going out with another woman from work. I am so upset! I know we aren't getting married tomorrow but how can we get a fair chance if he's spending time with this other chick? I don't want to be a crazy stalker or some obsessed woman, but I odn't know what to do because I'm not ok with it. I'm so worrie dif I bring it up that he"ll run. What should I do?