Why did the prison guard write a letter to his boyfriend about his thoughts and love, but didn't give it to him? Cann't prisoners in prison have emotional contacts? ...

This situation is hard to say, but it depends on the specific content of the letter.

In order to ensure the safety and stability of the prison, prison guards will consult the letters coming and going to the prison. Some sensitive words will be returned.

Such as inciting anxiety and leaking case information. Emotional venting may also affect the prisoner's mood.

The specific content of your letter is unknown, so it is not easy to comment. But don't be too emotional, it's easier to encourage people who serve their sentences with peace of mind.