Do you guys share the home equally? Do you use 50% of everything? I may be wrong, but I'd bet it would cause a very big issue if you informed your boyfriend that you no longer feel like you should pay half if you're using half! But maybe you aren't! I don't know!
IMO if the situation was reversed and a member posted that all of a sudden her live in boyfriend didn't wanna pay half anymore I think the responses would be very different.
Obviously we've only been given a tiny snipit of information, so that's all I can base my opinion off of. But truly I don't see why whose name is on the mortgage or who makes what amount of money matters when you're sharing the entire home. But again, that's just based on the info you've given.