Give him some time (to feel that his divorce had actually taken place not only literally but to register it emotionally) He may have been burned out from the whole ordeal and mentioning of marriage now can seem stressful. You have known each other for a while and fell in love again with one another. Rushing into signing papers won't change how you feel about each other. As you may have seen, being married does not provide any more security of fidelity. Just let things settle, make some short term goals with him of what you would like to do next and take it from there.