Did he tell you he wants to screw you over, or are you just assuming? The forms made every indication they were not to be taken lightly. It sounds like you made a choice, without much thought, to chase after someone seemingly more perfect than him, rather than work things out, give things time, learn to accept each others differences, do counseling, etc. You basically have two choices - you can either try and unscrew what's already screwed up, or you can live with the consequences, and support him as you agreed to. This (sponsorship) is a very big deal.