OMG Here we go again!! What Have I Done??

[Hope4us]

I think you just need to list out your boundaries that he needs to adhere to and if he agrees, then he can come home.

New cell number.
No Contact letter approved and mailed by you to OW. If OW contacts him or vice versa he needs to immediately tell you. If he fails to do so then you decide if he gets one strike before you kick him back out or not.
Complete transparency in everything he does.
MC if you choose.
Any slip ups and he's out.

Anything else YOU decide YOU need to feel safe. If he can't agree to the things YOU require, then it's obvious he's not serious.