First of all, kudos for even noticing that.

[She actually didn't catch it until her fifth viewing which was ... A long time ago.]

But don't you think he could have chosen to end it or stay in it with more than a dramatic jump? It's true that we can't be completely sure if he left it or not, but choices like that aren't meant to be cut and dry anyway.

[And the emotional breadth needed to fully expand on that and make either decision as weighted and realistic as needed would be whole other film. Maybe two.] Either way, it's a choice he got to make after learning the truth.