I'm going to tell my wife she needs to be more interesting
I hope that's not true. Why do you want her to be more interesting?
I'm tired of always having to ask her if she's doing ok.
She's your wife and it's rude to tell her that she's boring. You are expected to get along with her. Don't try to change what she is.
She's so boring and I bet if I get someone new I'll be happier.
It seems like you are quite unhappy with your relationship. Don't you think your wife would be saddened from how you think of her? How about trying out couple's counseling, with communication you can improve your relationship with her.