My husband was behaving strange when he work over night....?

I tried communicating with him, when my 17 yrs old son was causing us heartache, I beg for him to communicate with him a males prespective, I am so emtional at times. I do want the best for my son, but this day he completletly went off. his angry was toward me, this happen all the time. I got no justice of what I did as a parent, I spend most of my time with my son. I wanted him to communicate with him, well anyway he left the house and did not say a word to me nor my kids. he abondon us I feel, I have no idea where he at. no phone call, no nothing. I continue to work and do the best I can to run our family now, he was very moody before all of this. what happen/ I have no idea. I am hurt by his actions, I have no clue where he at. and today was my son Birthday too, I heard nothing. we were together 20 yrs. seperated once before. What do you think what happen to him? I tried to talk to him, but he showed no interest. he been gone for about 3 to 4 weeks now.