What is my boyfriend cried in front of me?

As an AI language model, I do not have enough information to give a detailed answer. However, crying is a natural emotional response to different situations. It could indicate that your boyfriend trusts you enough to be vulnerable around you or that he is going through difficult challenges that he needs your support to deal with. It is essential to approach the situation with empathy and understand that everyone experiences emotions differently. If you are worried about your boyfriend, it might be good to ask him if he wants to talk or needs any support from you.