Hi Kaffee what would happen if you were both busy? I am experiencing this with the woman I am dating. Her ex started out by cutting out a few hours here and there. Then it just kept growing and growing. And he is slowly removed himself from being a father. Now she has to address this situation. And get it resolved.
When you allow them to be a parent when they want to you are hurting the children. They are not having the opportunity to redevelop the relationship. Or they figure out that they are a burden. Which is what they are if they are being dumped for a date , concert , short trip, sleep over ... etc.... And they will figure this out soon enough. Which creates more life long issues.
I think that this is an opportunity to set a healthy boundary on communication between you two on the subject of your children. That way it can be communicated to your children in advance so they can be ready as well. This also shows to the children that their well being was taken into account as well. And that the both of you are working together to make sure they have a safe environment at all times.
Remember that the current flexibility is only flexible for one person here. Positive for them. Negative for everyone else. Resentment will grow. It is only a matter of time.
Flowers always make people better, happier, and more helpful; they are sunshine, food and medicine for the soul. unconditional love is awesome!