I am not gay, but I can understand why you chose to do what you did. I think saying you have a girlfriend might make it more complicated, because now it is a lie, rather than just not saying anything regarding romantic relationships. Although, if you are in a relationship, I can also understand wanting to be able to share stories with coworkers without revealing the person’s gender.
I don’t know the specific group of people you work with, but I will put this out there. I am a straight married woman living in a place that tends to be in my opinion rather antigay in that most are against gay marriage, I am in the bible belt, and people seem to just not “get it” when for me I don’t see why anyone has to get anything. I don’t understand the big deal, why can’t every adult choose for themselves who they want to have a realtionship with (and when I say choose, I mean in the sense of it is none of anyone else’s business). Here’s the thing, these same people who vote to outlaw gay marriage, and believe it is against God, well, when they know someone gay they seem fine with it. They show them the same amount of respect at work, I never hear anything bad said behind their backs, it really seems to be no problem. It is only a problem if the gay person wants the same civil rights, but assuming politcis does not come up at work, all good.
Having said that, it probably is not true everywhere. Sometimes people are so close minded, I would go as far as to say they are homophobic and horrible, that once they know a person is gay they treat them differently. It’s hard to know what will be the case probably. Especially as a gay person, I think most likely you are going to assume the worst, understandable. It’s like for me if someone says something that seems antisemitic, are they antisemetic? Or, are they just stereotyping, but don’t really think what they said about all Jewish people. I actually rarely worry about it regarding being Jewish, but I do as an atheist.
My husband and I hear people say stupid offensive things about Mexicans, and we don’t assume they will treat my husband differnlty when they find out he is Mexican. It’s tricky.
Anyway, I see nothing qrong with you keeping it to yourself if it makes you more comfortable. If it makes you less comfortable, then I think it becomes a problem for your own happiness.