Our teenagers lied in court..... how do you cope

Please no negativity I think maybe I just want to vent for us. Warning this is a long post. i don't even know if I'm in the right area for this post but I feel like only parents would understand. My husband and I have known each other 10 years, together 9, married 4. He has 2 kids from a previous marriage, she left him and took everything and even signed the kids over to him. Daughter was 1 and son was barely 4 months old. (9 months and 21 days apart of you're wondering) I met them when she was 6 and he was 5, my husband asked them when we were serious and I had been around them for a year but before we move in if they like me and if it was OK for me to become family. He had been divorced already and had primary custody and the mom every other weekend visiation, Summer week to week. Me and him already discussed all matters and if there was a No from either kid we wouldnt move to the next step at that time. Obviously it was all yes. We rounded both our jobs around the best working hours and close to home. Always on vacations together, me and my stepdaughter grew VERY close, which made mom jealous but she also had a new man. Fast forwarding stepdaughter was in Behavioral counseling just before I came into the picture this has on and off thru the years and is now as of 2023 diagnosed with multiple Behavioral Disorders(6) along with depression and anxiety. Stepson had a meltdown in school and we brought him to the doctors, they said nope he needed to go to Behavioral. He was committed (2024) and released with multiple Behavioral Disorders(4) as well. Mother went and filed a Protective Order right afterwards saying it was abuse per the father and was granted temporary custody. We just had court (March 2025) and the lawyer (even short notice) didnt even bother to tell us that all our proof was going to be hearsay. He didnt even say hey you should have the court reschedule and we subponea all this proof in nothing and he lost all custody and parent rights. The GAL never contacted us, she didn't even go thru the SAME documents we had. BUT justice was given today.........if she did this to other parents.......God rest her poor soul. CPS reported no abuse, therapy sessions no abuse, doctor cisits no abuse..........We can amend it yes but would you want to after you hear your kids lie. how do you cope with the fact that everybody n her side including the kids, lied. We both thought we and the kids all had a great relationship. Even the therapist was shocked to the news when she called because they missed an appointment. Husband is so heartbroken probably more than i can even explain when I see him.........the kids just didnt want to come back to him, he's not even sure he wants to fight in court again even tho we have the all proof. (She will be 16 and He will be 15 this year) We also understand teenagers whatever please them at that point in time and maybe its the mothers time to have them and we will be early empty nesters.