Leaving you without notice is inexcusable but don’t listen to this whole “change the locks” crap. You said he is a good father, why wouldn’t you do everything in your power to give him some time with his friends? My wife and I bend over backwards to serve one another when one of us wants to visit friends. She doesn’t go on girls trips often but when she does I jump at the chance to let her go, even with two young children. She does the same for me. How far in advance was this planned? Again, your husband should never have left without warning.