Mighty, I am sorry your son is struggling. My son was 16 when this all happened.
There were times when he would be really angry with me and reach out to his dad. I realized a few things. I was safe. He had no doubt about my unconditional love. His dad, not so much.
They are becoming young adults. Hormones raging. Family breaking apart...a whole lot of crap.
Here is what I want to say. Stay the course. Enforce your boudaries. Do not accept disrepectful behavior but pick your battles.
There were days when my walking into a room annoyed my son. LOL! I kept to my roadmap. He made it through. There are some scars. That's the truth of it. He still hasnt completely found his footing.
But we are very close. He is an amazing young man. I am honored to be his mom.
You do need to try to set some boundaries with your xh. I know he is hard to deal with, but, this is setting a precedent you dont want.
I am not saying he shouldnt reach out to his dad. But bringing him for a freakin slurpee??? Really???
You will get through this. He will be ok. He has you for a mom.
Stay on top of it. Trust me, it will matter one day.
My son has said to me, "Thank you for never giving up on me. I know I was really nasty to you at times, but, I knew you would never leave me. I wasnt sure of that with dad."
I know you will handle this in your wonderful Mighty way.