Is it possible to have a healthy relationship with someone who is schizophrenic?

I got an ex who suffers with the mental illness and I began dealing with him again only to deal with the negative symptoms of the illness that affects him, I recently said some rude things to him now feeling bad because i forgotten that he once told me that he was dealing with the illness... I texted him and gotten no response back so I take it that this is his withdrawn stage... He continues to lie about little things like being employed and I always believe the BS and help him out when i can by giving him money and then i would catch an attitude when he doesn't live up to his promises... I know it isn't right for me to be acting as such but his deceptive personality grinds my gears...