Should I put him in a home?

I take care of an elderly Step-Uncle. I have for 18 years. He is deaf, unable to read or write. He is 75 years old and in good health. He communicates like a 3 year old. He is the most loveable man with such a sweet heart. His ablity to understand things is very hard due to his communication skills. I have over time learnedhis way of communicating but there are times when we just cannot. It gets so frustrating. Some times I just want to give up. I am only 38. I cannot leave him alone ever. Today was a very HARD day as we cannot communicate about a very important issue and he has stormed off and is outside and will not come inside. It is 38 degrees out. He will come in eventually he is just throwing a fit. I get so worried at times like this, and it is killing me. I have an illness myself. I want to put him in a home, but I just know he cannot communicate with people. He would die. Is this really my responsiablity? Should I feel so guilty for wanting to put him in a home? Is this way to much of a personal choice question? Or can someone really answer this for me? Sorry it is so long…=Z