It's hard now, and you will have hard days ahead, but none so hard as living with an active addict.
If his stories are similar to my sons, there is no lady and no car, just drugs. Please hang on to your money and keep it safe, and your valuables too. Maybe change your locks and install an alarm. Sadly, he may come back for more.
My prayers go out for you and your son. Your son will do better with one happy parent than 2 who are living under the dark cloud of addiction.
Hugs