Yep. Mine was in this situation. He texted his mother hundreds of times a day, visited her daily, called her every day...you get the idea. That might have been okay if he had also spent time with me lol, but he flaked on our plans for her and then told me I was jealous of his close family.
It's actually worse than I'm making it sound, but I have to leave out some details since this post is public.