Nicknames are like bad pop songs: once they get into your head, it’s so hard to get them out; mind you, you can also use this to boost your relationship. Making your lover a friend has proven to strengthen relationships. So let’s do this; give him a nickname based on something important to him, say he plays football or any other sports, a nickname related to what he has passion for could make him feel like you are behind him.
So if he’s getting in shape lately, playfully call him ‘striker’ or ‘my striker’. Yes, it’s cheesy, but he might like it and make him believe you support his goals.