Teenagers...gods way of limiting the species

I know some of you remember that my teenage boy, Eric, decided to go and live with his dad this past March. Well, just to update you with the latest, he is still there. Since March the number of times he has visited can be counted on one hand. So, this being the holidays, I called him last night to see what the plan was for Thanksgiving. In his most hormonal and "stressed" teenage voice he replies, 'the word Thanksgiving has not even been mentioned here yet'. I ask him what his plans are since he seems to be making his own plans these days and he says,'call my dad and see what is going on'. He also says that Thanksgiving to him is just another day off from school. I guess he misses the part where you are supposed to spend time with family and appreciate what you have. I proceed to say that he has not been over to visit in quite awhile and that he should not forget his other family. We have not told him about this baby yet and I refuse to bring it up until he visits us here. By the time he comes I will probably be quite pregnant. Am I wrong to wait? I think it proves a point on just how little time he spends with us. He says that he has been very stressed and that his grades are A, A, A, C, and D and the latter two are in honors precalc and French 3. I proceed to say that I know he does not keep his nose in a book all weekend and that he needs to come and visit. He continues to himhaw and never does commit to any time here. I end up very frustrated and end the conversation. After getting off the phone I am of course in tears. I am at such a loss as to what to do. I do not think his dad is making the effort to encourage his visits here. I hate to go and grovel to him for help. Is this just a phase and will he snap out of his own world and come back? I guess frustration is very typical with teenaliens. They can be such selfcentered beings. Ok...breath in and breath out. This too shall pass.