Yeah, I can expand. His dad was in the military and overseas for much of my boyfriend's childhood and thus he was basically raised by a single mom. So they are very close. She is also very protective of him because he dated girls in high school that were attracted to his money and stable home life more than him-- one of his girlfriends faked a pregnancy and then miscarriage in their early teens, and another managed to stay over at his house for christmas eve/day (with his family) only to tell him hours after christmas that she had been cheating on him....
But I think I'm his first girlfriend who has long-term potential. I hope that doesn't sound like humble-bragging but we are compatible and very close despite his introversion. My boyfriend has historically gone to his mom for most things but now he is turning to me for help/support more so. I guess to provide an example, he asked me to go with him to look at an apartment and asked me for advice on it rather than his mom. When we next saw his mom, she seemed taken aback that I was the one he turned to for that.
And, also, this might seem weird, but she points out our similarities a lot: not in a relatable way but in a he-likes-you-because-you-are-like-me way. For example, he mentioned he liked my hair in a certain style and his mom added, "That's because my hair has always been styled that way." This stuff only started until we had been dating for longer than my boyfriend had ever been in a past relationship. I also know that she had recently questioned his intentions with me as well. I don't think the intent of her actions and words is mean spirited but it is certainly notable.