There was never any doubt that Ryan would endorse Trump; he couldn’t very well run the convention as his declared opponent. On the other hand, Ryan fancies himself a principled conservative, and he undoubtedly views Trump as an apostate, an obstacle to his agenda and future ambitions, and a likely electoral disaster. The relationship between the two, therefore, was always going to be tricky.
I would describe Ryan’s approach to Trump as “love the sinner; hate the sin.” Ryan clearly believes he can square the circle in the eyes of the public by formally endorsing Trump, but making public his disagreements with him, and thereby keeping what he thinks is a safe distance.
I don’t know if it will work or not, but it might. In any event, I think it would make a good template for our relations with friendly Third World dictators.