I think he stuck by you for so long because you gave him all that attention. Now with three kids, he knows he's not going to get much of your time! I agree with the others. Get a lawyer so that you can file for support. He is a BIG BABY that never learned how to grow up. I also think that you should work on setting stronger boundaries and learning to say no instead of always being the one who is constantly giving. A relationship is give and take on BOTH sides. You do all the giving, and he does all the taking. I wish you the best.