Why do women have a problem when their mate's friends are single?

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I'm killing some time at work as I wait for the rain to ease up so that I can go back outside and finish up. This came to from over the weekend after talking with my best friend ove the phone as well as speaking to his girlfriend withing the same conversation. Now my friend has and his lady have relocated to another city and have their own place and is doing very nicely. The this is as I was introducing myself, his girlfriend asked me whether I was married or do I have girlfriend. I responded to her that I was neither married nor was I in a relationship. Although I've met someone, we're still brand new to each other. So technically, I am single. From the moment I gave my answer to her, I could hear the air delfate out of her upon hearing that revelation from me. It was like what I said was toxic to her ears and I am pretty sure she probably had some unkind thoughts of me as well. Now this has been issue for me with some of my friends, because I don't wanna lose a friendship nor do I want to be used as the catalyst for why their relationship dissolved. I fell as if I am a pariah now. I chose to be single because I got frustrated with dating and having to deal some lunatic women. Now it seems as if I am being penalized for choosing not to rush into relationships and marriage, instead of me being understood for being wise enough to know that I don't have to just settle for whomever because of lonliness or because others feel that I should be with someone for the sake of being with them. I have never led a friend to stray from their girlfriends nor do I have any intentions of doing so. But I still wondering why do they have an issue with me just because I'm single. Feedback appreciated.