Guess what I've learned... mums that are planted don't get knocked over in the wind. Go figure!
Use all that thinking for you.. not trying to guess what her motives are. Mr. Nice Guy still makes dinner. If you want to make dinner, do. No expectations, no intentions.
How do YOU think the improvements look? Fishing for attention from her is a no go.
The cat thing is tough because you really loved that cat. Look at your options. Now that you've made the break do you want the cat in your life? After all, you did give her YOUR cat so she wouldn't be lonely.
Oh yes.. I have a new term for my gardening abilities... "dump landscaping". Yes.. yours truly had placed leftover slate to make a sorta walkway over a barren area. Add two barberry bushes, some stone work to handle copious water flow, two extra bags of mulch.. voila! I won't show it to you but it looks better than what was there!
Be your best friend. Focus on what is good, healthy, for you. Figure you out, not her. If you're upset, angry.. just say what's bugging you. Avoid getting caught up in passive/aggressive, bottled up anger situations.