Maybe he is also threatened and scare by your gin to school and getting job. As you worked on yourself, what did he do? Has he done anything to improve himself, learn a new trade, make more money? He my also feel you are growing beyond him and he is not good enough for you, that in some way he is holding you back. If so, he may see your moving on as inevitable. Is he prideful? If so, he may be wallowing on his pity pot.
What can you do to make him feel included and not left behind?
