I am feeling like we are one in the same. My ex is ALWAYS dishonest, he "says" he doesnt talk bad to the boys about me but i think he just has a very sneaky way of doing it. I feel your pain E....it is not easy. I keep my kids 2 weeks at a time, he gets them the other 2 weeks, every single month. I know that you have lots of negative feelings toward him and Im sure that sometimes it is very difficult to restrain from talking negatively about him BUT...it does get easier. I have been separated 7 years, divorced 4 of them. He still makes me angry, I dont agree with a lot of the things he does, but..he is their dad. Even though they are older now and know how he is most of the time (evil), when they were little, they loved him to death. They dont understand at 6 and 2 what to believe and not to believe. They know that you are the mom, he is their dad and that things are not the same. Your 2 year old wont remember ANY of this. My youngest is 9, he'll be 10 in August, he doesnt remember his dad and I ever living together.
I guess what Im trying to say, your feelings are legitimate. You will always miss them, (wait until the day they come home and run straight to their friends!) Your ex may or may not ever grow up. If he does, great, if he doesnt, you take him to court to get the kids full time. It will never be easy to see another woman "trying" to raise your kids. Most likely, when your children get older, if he has various women trying to take your place, they wont like either of them.
Divorce is rough. Unfortunately we dont get how brutal it is on the kids when we decide to move forward in divorce. Try not to think about how hard it is on your end, more than likely, the little ones feel lost, so you need to be there to pick them back up, dust them off and let them know everything will be ok. Which is where the ex's lies will not work on them. They will see how loving you are and at some point, will come to resent dad and see him for who he really is. I hope that this makes sense and that my thoughts are not all over the place but they probably are since my ex is a sore subject for me too. 3/4 of the time I post to this site, it concerns him,....go figure. Good luck, and keep that head up.