I would ask your h if he would let you know when he's going to be out of town because you have some plans of your own that will take you away from home some this summer as well. Let him know that you are willing to work w/him on a schedule so that the home is well kept and the dog is taken care of.

BTW, he's not thinking of anyone but himself and sometimes we to nudge this a bit and remind them that even as roommates there are still some things, like schedules, that need to be coordinated.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.