Your girlfriend’s jealousy makes it impossible to talk about other women in any context. Whether it’s a female coworker, a co-ed softball teammate or the same barista who knows exactly how you take your coffee, utter the name of another woman and she immediately develops an attitude.
Why It's Harmful: Imagine this relationship does go to the next level. Now imagine the next 50 years of life without mentioning anything involving another woman. What were to happen if a promotion at the office meant working with an attractive female boss? Suppose the house next door is sold to an older, single woman? Even though these women have zero interest in you sexually, daily interaction will be a normal part of life. Are you expected to never discuss work or home again?