Breaking away from someone you have spent so much time around can feel such a hard place to be in, however when two people come together their individual difficulties can make it even tougher than a regular relationship and perhaps you will (even if it might not feel like its possible now) each be better off with a chance to each meet someone else who is more available to be there for you when things get tough with your anxiety (or in his case, his schizophrenia). I wish you the best of luck ahead