For you to make someone miss you, you have to do some certain things that will be special to them. There are certain things you can do to your boyfriend to make him feel your absence when you are not around or miss you.
SPEND QUALITY TIME WITH HIM
You can not make someone miss you when you hardly spend time with the person. For someone to miss you, the person has to be fond of you. This means that for your boyfriend to miss you, he has to be fond of you and he can only be fond of you when you spend quality time with him. So as much as possible, try and spend quality time with your boyfriend.

LIMIT YOUR ONLINE PRESENCE
If you want your boyfriend to miss you, you need to limit your social media usage. You should avoid being constantly online. If you are constantly online, he will not feel your absence too much. So, for you to make him feel your absence then you have to limit the time you spend on social media.
WHENEVER YOU ARE WITH HIM TRY AND MAKE THE TIME SPECIAL
If you want your boyfriend to miss you, you should try and make every moment you spend with him special. This way, when you are not around he is going to feel your absence.