Eyes are perhaps the most useful tools at your disposal if you want to express something without saying a word. A simple glance could mean a lot to him. As it is said "eyes are the mirror to one's soul". So, ensure that you don’t fail to make eye contact with him. Even when your man is not looking or feeling his best, look at him as if to reassure and reaffirm that your are there right by his side. If your eyes can express a degree of admiration and genuine concern in such situations, it reflects you truly care for him.