Quote: Do you think that with H even mentioning the idea that he 'maybe could have saved the marriage if he had been harder on me' means that he is at least thinking about it, if only remotely??
Yes.
And even though he's staying with OW1 (yuck!) he seems pretty interested to have lunch with you and interested in maybe coming for dinner - doesn't seem like that would really be the case if he was all involved with OW romantically again.