Yes, it's quite normal for a walk away spouse to want to "share" in the gift giving. They do not like to spend money and they figure if you will go in half way, it's less for them, as well as sometimes, they will say they want to share and after you purchase the gift, they do not split the cost w/you. Also, it is far easier to get you to purchase the items and let others think that it is a joint effort and appearances do mean everything to them. They want the world to think you are okay w/what they have done or are doing.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.