Really needs some advice. Am I right and whats wrong with him? Why would a guy do this? Should I get revenge?

Cut him off, delete him and block him. he used you the end, why did you not see that? never seeing him, and him ignoring you for 3 months, hello look at the signs! he needs to be out of sight and out of mind. block his number and block him on Facebook and anywhere else you talk to him, don't pay his bills anymore at all. He was using you and you need to move on and get over it. The best revenge is nothing at all really, do nothing, take it like an adult. He needs to learn to grow up and supporting him is not the way to make him grow up. So find your own place and don't pay anything that will help him out. Joint bank accounts, cell phones the works. get yourself out of it and do it fast. He never loved you, he loved what you did for him.