What is why would my boyfriend deactivated his facebook?

As an AI language model, I cannot access personal information or read human intentions. However, I can suggest some reasons why someone might deactivate their Facebook account:

1. Privacy concerns - Facebook has faced various data breaches and scandals. Some people might choose to deactivate their account to safeguard their information and protect their privacy.

2. Addiction - Social media platforms have a way of consuming your time and causing a distraction. Some people might feel that their time would be better spent away from social media.

3. Bullying or harassment - Unfortunately, some people use social media to bully or harass others. If someone is experiencing abuse on Facebook, they might choose to deactivate their account to escape harassment.

4. Desire for a break - Sometimes people feel overwhelmed with constant notifications, updates and other social media activities, causing their attention to be divided. Some people deactivate their Facebook account to take a break from social media and realign their focus.

While these are some possible reasons behind deactivating a Facebook account, it would be best to ask your boyfriend directly to understand why he deactivated his account.