Should I try to get my Ex husband out of my childrens life?

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My ex husband and I have two children together. He is a very unhappy person, very negative, and selfish. My oldest son idolizes him and is acting just like him. He will pout, cry, and complain over everything that doesn't go his way. here are some examples. Took them to a fun park full of great things to do. we rode rides and then went to watch fun kids shows. My son didn't want to and he sat there complaining about how stupid it was and pouting. Then once it really got going he enjoyed the show. Yet he tried to ruin it for everyone before he even gave it a chance. We took them to a zoo and it wasn't what he wanted to do so he complained and pouted most of the day. This type of behavior is one of the reasons I divorced my his dad. Okay so here is the real problem. My ex will not keep a job, he will go weeks without calling the boys or coming to get them. every time he does this my oldest son will cry and emotionally pull away from everyone in the family. My ex will tell lies when he does finally show up or call saying he had to work or go out of town and then I will find out he was not working because he quit his job and was out at the bar or somewhere else. He has went several months without a phone call or seeing the boys. About the time they adjust to him not coming around or answering his phone he shows back up. Then he will do better for a couple of months. I don't understand how someone who only sees their kids every other weekend can blow them off like that. He has all week and every other weekend to do what he wants to do. He has also been weirding out when I do talk to him. He acts like he has been drinking or on drugs. He asked about getting the boys a couple of weekends in a row and I said so you are wanting them fourth of July? He was like oh that is next weekend well never mind then. Another time he kept saying hello every time I would say hello like he could not hear me until I finally said what do you want. Then he called my husbands number asking if my husband would hire him. And my husband kept saying hey this is Travis. Finally my husband had to say hey man I thought you were calling about the boys. Then my ex was like oh sorry Wrong Travis. My ex said he would start picking the boys up on Thursday night during the summer and then don't show up again. He is back on a downward spiral again which means he is back to lying and not picking them up again. I don't know how long it will last this time before we hear from him again. I called and left a message on his phone telling him to man up and be a father to these boys and stop lying to them and pick them up like he is supposed to. My husband is a great dad to these kids and is there for them in every way he can be. We have talked about drawing up papers and asking my ex to sign away his rights so that my husband can adopt them. My husband backed out because he did not want to hurt the boys that way. But I am tired of my ex dragging out the hurt and I some times think it is best to just cause one big hurt and then the worrying and waiting on their dad will be over. They will no longer be hurt every time he don't show up. which is happening more and more all the time. Is it wrong of me to want my husband to adopt my kids? Should I have the papers drawn up and just see if he would give up his rights that easily? What are your thoughts on this delicate matter? I just want to do what is best for my boys.