Rant. My ex is a pos. It's been civil for the kids due to his gf is great and I wouldn't trust my…

Rant. My ex is a pos. It's been civil for the kids due to his gf is great and I wouldn't trust my kids with him alone. I went into town and my four year old notices it's by his dad's house then starts crying for him. So I go ahead and find out if ok to bring them by. Had to wait until 1:00 because his gf said he was still sleeping. He stays up all night on video games and sleeps all day. I let the kids spend the day with them unscheduled. When I picked them up their dad was holding my four year old saying What's wrong buddy? My son was crying for his dad. He wanted to stay. I was thinking you jerk you know what's wrong and your manipulating him ! Then his dad in front of my son said if your mom lets You next week you can stay the night! My son cried all the way home. All he does with them is play video games!!!! Nothing else !!