I agree, you should not reach out anymore than you already have. You have already made your concerns for this man very clear. As you mentioned in your message he has not been texting and or communicating with you as he had previously done with you in the past. He appears to be exhibiting distancing behavior, as he agreed to contact you when he was feeling better but failed to do so. It appears that he may be distancing himself from the relationship entirely as his behavior (inconsistent and distancing) started before he became ill. You have already contacted him, in an effort to know with some degree of certainty where he stands in this relationship allow him to reach out to you if he is interested in maintaining the relationship.