I'm forcing my boyfriend to redecorate his house the way I want.
Why are you insisting he redecorate it?
Because it looks terrible the way it is.
It's good to be helpful, but you shouldn't overstep your boundaries. If someone wants to redo their house then you should allow them to do it their way instead of being pushy about it. They may stop coming to you for guidance if you're forcing them to take your advice.
This is important to me. I can't stand the way his house looks right now and it needs to be fixed.
I understand that it's important to you, but it's your boyfriend's house. You should let him decide to decorate his home how he wants. I'm sure he would be willing to listen to any suggestions you have though!