My boyfriend takes photos almost every time he eats ~ but he doesn't upload them to his circle of friends ~ or he is not seen by me.

There may be many reasons to explain your boyfriend's behavior of taking pictures without making friends or being seen by you. Here are some possible reasons:

1. He likes to record his life: Your boyfriend may like to take photos to record his life, but it doesn't mean he has to share these photos. This may be his own record, not for others to see.

2. He doesn't want to make it public: Your boyfriend may have some private life, and he doesn't want to make it public on social media. Taking pictures may be his personal interest, but he doesn't want to show it in his circle of friends.

He doesn't want to attract unnecessary attention: sharing photos on social media may attract some unnecessary attention and comments. Your boyfriend may not want to deal with these extra attention, so he chooses not to share photos.

He may think that the photo is not good enough: sometimes, we may take a photo, but later we think it is not good enough or there are other problems. This may be one of the reasons why your boyfriend doesn't upload photos.

He wants to remain mysterious: some people may like to remain mysterious and don't often share their lives on social media. Your boyfriend may want to keep some personal space and some mystery.

Whatever the reason, it is important that you should respect your boyfriend's privacy and decision. If you are confused or uneasy about this, you can communicate honestly with him and seek his explanation and understanding.