Remember, MLCers are incredibly selfish and will only do what makes them "happy." S
A, it stinks that your H is blowing off his Ds to run errands with OW. Just be glad you are not the parent who is doing things like that - that is not the kind of behavior they will associate with you.
My S has made comments about how I "know how" to love them more than H. It kills me to hear him say that but so grateful they know how much I love them.