You need to bring your mind to work here, To spy on your boyfriend’s account you need to take help of his cellphone, Yes spying on his cellphone can allow you to spy on his Facebook account, What you need to do is, Once you get access to his cellphone you need to install spyware on his cellphone, And this spyware will do everything for you.
mSPY is an app which once installed in someone’s phone allows you to track their Facebook messages at realtime, You can view all of them remotely from your computer.
Another great feature of it is Keylogger, which allows you to get log of each and every key pressed in his mobile phone and that each and every key also include his Facebook password, So with this method you can also get his Facebook username and password, which means you can login to his account whenever you want.
mSPY is a paid app with great features and cheap cost, You can get it at mSpy.Com. hope this help!