How should I feel?

Me and my ex have two kids together. We lived with his parents ALOT. If we didn't live with them, we lived just houses down. The last year we were together, we lived 20 minutes away. We split up (after 6 years), because he had his own problems - our kids didn't need to grow up seeing them. I was giving him visits, and he came over any time he asked to see the kids (2 and 5 then). I went out of my way to bring them to his parents house - he moved in with them upon our split. They weren't very welcoming. Not rude, just not "nice". I knew he was still in his habits, and his parents constantly took up for him. He went to rehab, for 6 weeks, and was back at it a week or two after his release. I decided it was time to put my foot down. I wouldn't let him take the kids. I made it clear that he wasnt to transport them, and I was going to supervise, even if from a distance (for instance, I offered to bring them to the park, for him to see them) he wouldn't have it. I just done everything I could to keep their visits, but to also protect my babies. He went to a sober house, left the sober house, took another woman and her child out (I throw that in because he PROMISED our kids days out, and never done it) and that same day he was drunker than a sailor. He ended up almost hitting a cop, and evading -all with this woman and her child. There are a slew of charges. He done ALL this, while I was at his house for a visit with his parents. I posted on social media, asking for prayers, because he made the front page of the paper. There was NO keeping it on the down low. He has been back in sober living, since mid October.

Here is my dilemma --- his parents have contacted me ONE time. His dad was pissed that I posted on social media asking for prayers. He wanted it to stay "local". They haven't asked about the kids, who were close with them. Literally NOTHING since a week before Halloween, to tell me how wrong I was and how their son made a mistake and I should be more forgiving. We lived with them, and they witnessed how abusive he is.

My ex SIL screen shotted messages showing her mom dogging me. Because I apparently put her son through hell over the kids and caused him to relapse. Its just a never ending enabling cycle.

I'm trying to tell myself im not upset, but I am. They haven't messaged about what the kids may want for Christmas, to spend some time, nothing. I don't get it. I get they may not want to be around me, but they claimed to love the kids so much - but haven't spoke a word. Even their dad (my ex) is managing to see them for Christmas -from a sober house. It just hurts my feelings, for them. Should I just let it go? Or is it okay to feel this way? I will say, "grandma" does have health issues, but she made it to the sober house, twice already and we live ten minutes from it.