No need to feel bad.
You probably don't want them to rain on your parade. If You know you're happy, you don't need anyone else's validation to continue to feel that way.
I can understand how you don't want to downplay the importance of Maria in your life.. but if they really wanted to know, they would ask more questions. It's not really their business though. You're happy. That's all they need to know. As long as Maria knows how important she is, what others know and don't know, doesn't really matter.
i just don't like misrepresenting myself, because it feels like shame, and i don't want to be ashamed of anything that i'm doing, because i'm really happy with how it's going.
they wouldn't necessarily know what questions to ask lol i'm pretty private, i can't imagine a scenario where someone in my family inquired into my romantic life, especially since i’m married, because monogamy is just assumed.
I understand that too. No need to feel shame over the scenario though. You're not actively Hiding it. Just not bringing it up in casual conversations lol