Should I leave him?

We have been together for 6 years, and I have never met his family or know where he lives. I never asked him. He knows where I live and has met my family. He is works in education and has a student whose family life is unstable. He is no longer working there but he took her in and now she lives with him. Supposedly his "mother" lives with him.

I haven't met her either, and now I feel like he probably has a wife, and that is why he is letting this 14 year old live there. I feel so left out in all of this, and I plan on leaving him, but I don't know how to say it.

Should I leave him?
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