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my question was more how should I go about it to spark a change between us to fire things up. for instance, should I give a reason why I'm not gonna make it over, give no reason, tell her I think we spend too much time together, pretend I'm not interested, or any other way of putting a flavor to the action. basically what would one think is the most seductive way to create space. creating space is a no brainer, let's see what the community can best come up with.
Perhaps, tell her you would like quality time together instead of quantity. Sounds like you could do with some alone time since she is a little grumpy and you're feeling like a caged bird. I really don't get how you haven't tried this already with her. Also, her mum is very tolerable, i'm surprised you're not be charged rent yet.
Talk to her like an adult. Tell her you feel a little suffocation and some distance could make you miss each other more.
The reason why i thought about the cheating thing was because i don't think even happily married couples spend every second with each other like you both do. You should be a busy guy working on your stuff instead of watching Game of thrones every night and burning the candle from both ends.
Edit - think jackzero and i are on the same page and his has done a better job at explaining than i could.