You are allowed to express your feelings to the person you love. Don't be shy. Too ego to do so? Just lower down a bit of that ego for this simple task. Anytime anywhere you are allowed to do so. That person would smile receiving your message, even by sending the 3 little words, "I love you"...or even "smile dear...miss you". Sweet and it means a lot.
Of course you are always thinking about him/ her. So let them know how much you love them. It is not a big task.
You don't need one hour to do so, you don't need 10 minutes to do so, or even 5 minutes. Just 1 minute, you can send the text to them and...
VWALAH~ bring happy smile in their faces.
Simple yet means a lot. You happy, they happy.