It could be that the story hasn't developed enough to bring those people into your character's life. Or perhaps your character has trust issues preventing others from getting close.
Maybe it's because the story's setting or your character's personality makes it difficult to form close bonds. Or could be that the plot hasn't developed to that point yet.
Well, you could try doing things he likes together to strengthen the bond. Also, showing appreciation and support for him can go a long way. Sometimes, small gestures of love and care can make a big difference.
One way could be to have heart-to-heart conversations regularly, listen to his perspective, and work on resolving any conflicts together. Surprising him with small gestures of love and support might also make a difference.
Could be that there's some sort of connection or misunderstanding. Maybe she needed a place to stay or was looking for someone and ended up there by accident.
Maybe you don't have to tell your side of the story because the truth will eventually come out on its own without your input. For example, if there are enough witnesses or evidence that can speak for you, you might feel it's unnecessary to add your own account.