This is a great time for you to ask him to send the OM a no-contact letter, and to agree to full transparency with you. Do you think that he'd be willing to do that?
The other thing that I would strongly consider is having you two DATE each other -- exclusively -- while he does NOT move back in with you (staying at his mom's would be great). For a period of time, say 3-6 months, to see how things go. Do NOT make the oh-so-common DB mistake of letting back into your heart -- and your home -- too easily!!!
