My wife hasn't been walking to work with me even though she promised and so now I'm very upset with her.
Why did you want to walk with your wife?
I wanted to bond with her, but she always finds excuses
Even though it might be nice to bond and walk with her to work, it is okay if she can't. She might be too busy and it might be better not to make a fuss.
She doesn't love me enough.
I wouldn't say that, she should just have more things on her plate right now and can't do it. You should be understanding of your wife if you love her and keep asking until she says yes to walking.