I know if my W had a similar conversation with me, my first immediate thought would be a sense of relief and optimism that she was finally coming to her senses - that all I had been working for was finally coming to fruition. However, I tend to be an optimist and see the best in everything without sometimes giving enough weight to the negatives in a situation.
My second thought would be - how do I know it's real, how will I ever trust her again. How transparent will she be willing to be to make me feel comfortable when she gets on the computer, takes a phone call outside, goes on a business trip...
I think you have to go very, very slow here. Is he just telling you the things that he thinks you want to hear? You're exactly right when you tell him actions speak louder than words. He is flip flopping all over the place so you have to question the sincerity. Obviously you still love him, you have a family together so if he can really change then that would be great to save this marriage. However he has so much work to do in order to really prove himself - there is plenty of time to just sit back and see exactly how sincere he is, no need to rush anything.
