Don't worry about who you irritate. Everybody has periods where they are not at their best. As far as him, it is a shame that he didn't figure out he wasn't ready before meeting. I agree that that change is not a coincidence. He may need time unfortunately. The reason you feel so sad is 1) you like him and he wasn't ready and 2) all of this is out of your control so there is no way to fix it without him changing his mind back. He is in control; it's his emotions that have to be "ready". With that sad, you really have no choice but to wait or to periodically contact him. Anything more will permanently push him away. You can contact him semi regularly but you may have face the fact that he isn't Mr. Right. I would email him and leave a note at the end reminding him you are there, but don't push it too much. You may find that he doesn't need that much time in the end and he will remember that he liked you.