Not sure where to start

[wishing, hoping]

So I am not sure where to go from here. After having a few decent days H comes home last night and is totally in teenager mode. Playing an online game on his phone from the moment he arrived home until the moment he went to bed. I have NEVER witnessed this behavior from him in the 14 years I have known him. The kids were trying to get his attention and S was practically begging him to spend time with him but H would not put down the phone. He even brought it to the dinner table while we were eating. I fought the inclination to be his mother and to put the phone away. That was a complete 180 for me. Dinner time is an important family bonding time to me. And H used to feel the same way. Or so I thought.

Last night I noticed H had an overnight bag packed so I figured he is running away this weekend just like he has done every weekend since December. S tells me this morning while waiting for the school bus that dad won't be home tonight and did I know that? I thanked S for letting me know and said, no, I didn't know that. S then tells me dad will be home tomorrow morning. I am ticked because tomorrow is S's birthday party and I will need help getting everything organized and I even told him that. So he probably will not bother to come back until it's time for the party.

S also told me that dad was not coming to Indiana with us to celebrated Easter and his birthday party. I told S I knew about that and asked him how it made him feel. He said it made him depressed. H can treat me however he wants. I am a big girl, but it really angers me when it starts to affect the kids. I don't know how to protect him from these Dr. Jeckyl/Mr. Hyde mood swings.

Some friends are telling me I should confront him and tell him his behavior is inappropriate and inconsiderate. But I think that would push him further away. I would appreciate any insight into my sitch. I could use some advice. : (