Mia: That's called stealthing and it's a form of sexual assault. It's dangerous because it exposes an unwitting partner to all kinds of possible risks such as unwanted pregnancy and sexually-transmitted diseases. Last fall, two member of Congress called for a joint hearing before the House Judiciary Committee on the nefarious practice, but that's as far as it's gotten at this point. Much more needs to be done on this since a whole lot of people don't realize the seriousness of this.
Steve: Key phrase: "I confronted him and he apologized." Which means he only admitted his loutish behavior after getting caught. Dump him. Immediately. And go get an STD test to be safe.
Mia: You can't. You can't either wait his mother out (she's not going to live forever) or accept that with this mama's boy, mama is still No. 1.