Frankly, I don't like being taken for granted. When someone takes you for granted, it basically boils down to you being an option or a choice, you no longer remains a priority. The other person may just keep giving excuses in their head, some being, "I don't need to give her any explanations or I don't need to tell her anything or I don't think she is going anywhere." They keep you at the back burner, because, guess what, they think it is okay to take you for granted!
And that's where the problem arises. It is never okay to take anyone for granted, even if it means it is your wife or husband or even kids. Treat them as individuals with their own preferences and choices. Ask them what they want. And above all, never assume that they will still be on the same page as you left them when you went off to complete your 'Important work.'