If he is "off with other women" you really have little choice.
If you wish to stay together, I believe , you should insist that this behavior stop immediately, That you get a a real promise that he will not do it again and that he will agree to a divorce with no fight, leaving all the marital assets with you if he does.
Mostly it will require his remorse. Less that you are fighting a losing battle.
His response to this request will prove one way or the other if he wants to stay together.
On the last item, I would insist on a contract, sort of a post nuptial, in writing with signature.
Any reluctance on his part to this would indicate he is not committed to your marriage.
His agreement will form a basis for continuing with your relationship.
As for trust, TRUST takes years to build and a moment to lose. You are at square one again. Without a basis for rebuilding your relationship trust will never be rebuilt.
Lay the ground rules, get some agreement that he hurt you and is SORRY and move on with your relationship with the knowledge that trust takes a long time to get back.
Get this stuff in place or move him out. Without some significant remorse over other woman I fear you are wasting your time with this one.