Your h may have had some problems at his "camp". He could have set the motion sensor up because the owner of the "camp" has been coming around. A lot of people have those sensors set up to alert them if someone is coming in their drive. Maybe solicitors have been dropping by trying to sell stuff....but the sensor thing isn't something I would be concerned about.
Sounds like your h had something else he was doing last night or maybe he was in a cranky mood and didn't want to have to put on a happy face to greet you.
Yes, you probably do have some changes going on within you. Make those changes work for you and your son. Nothing you say or do will change the path that your h is on right now, but you do have control over what you do on your path.
Sit quietly, the answers will come.
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.