OK, I didn't see this latest post from you here when I wrote you my last post in your Piecing thread. Sorry.
Some good signs there from him, but you have every right to be skeptical. Consistency in his ACTIONS (not his words) . . . over TIME . . . builds trust that can be relied upon.
Have you thought about what kind of transparency plan you would need from him in order to feel safe, and have you asked him for this?
Anyone can SAY they are going no-contact. The challenge is, some of them have no intention of keeping that promise, while a whole other group has good intentions but no ABILITY to pull it off (they are weak). A rock-solid transparency plan, discussed and agreed to, with you having at least ONE intel channel that's unbeknownst to him . . . that is your best chance.
Plus perhaps a Retrouvaille weekend, followed by some good ongoing marriage counseling, with someone specifically trained to deal with issues of infidelity. Please don't let him in too easy -- it's the #1 mistake people make here!! Let him EARN his way back in. "This is YOUR mess; YOU need to clean it up" should be your motto. Let him tell YOU what he's willing to do to earn his way back into the marriage.