Because you love your boyfriend so much, you care about it. Sometimes it’s his temporary thoughts that lead him to write a personalized signature, so don’t care too much. Don't care about it or ask questions. If you ask, maybe he will be unhappy and it will hurt the relationship between you. Give him some personal space. Life is short, as long as you love each other and take care of each other. Don't think too much, it will be too tiring to live like that.