He stayed for longer than he was supposed to, if it was bad may be he would have been back sooner? This is a huge step for both your S and W, they have to break ice and both of them will be stressed about it. Let him be, dont pry, he will open up when he is ready. May be at some level he also thinks, if you thought he really had a great time you may feel left out? It is hard to know but if he or your W show interest in doing this again you know it is going well. If your W is involved in your Ss life it is both their good fortune, otherwise you are always there for him, his stable parent.
