Seriously still debating

Ok So I have typed on here before about my wedding being a couple months away and having doubts...Now Im down to just a little over a month away and STILL having doubts. I recently have been having BIG panic attacks very often throughout the day just by even thinking about getting married! Im going to break the whole story down as good and as short as I possibly can for you all. My Fiance and I have been together for just a little over 2 years and have been friends for around 5 years. When we used to run around together as "just friends" things were fine, then we turned in to "friends with benefits". Of course this never works out because one ALWAYS ends up falling for the other. In my case it was me falling for him. He didn't want anything to do with me on a SERIOUS note however before you knew it we were dating and I wound up pregnant with my 3rd baby. This one was his the other two were from a previous relationship. He was not very good to me or my children. He was NEVER there for me why I was pregnant. After having baby he propsed and said things were going to change for the better. He has changed in a lot of ways for the better but there are QUITE a few things that still causes ALOT of problems between us. He is a disrespectful childish 30 year old male! I have explained to him that I think that we as a couple just aren't where one should be that's getting ready to get married in just a little over a month but he either gives me ultimatem or just acts like I never said anything. Im seriously debating calling the wedding off because I am terrified I could be marrying the wrong person....Please Help with some advice!!!!!

Wow! One positive thing I could see base on what I read is the fact that you two are friends before but having said that it doesn't mean that all is good and dandy. Marriage is more than two people saying I do's and going through the whole ceremony and everything. Marriage is an agreement between two people entering the two separate world and making it into one. There's a mutual understanding that you two are both into making things happen and not just one. An ultimatum should never be a part of it. You have every reason to have doubts base on what you wrote. Have you two ever seek counseling while you're engaged? Does he really know what is he getting himself into? If a person really loves you, he/she should try to be more understanding. This one was his the other two were from a previous relationship. He was not very good to me or my children. He was NEVER there for me why I was pregnant. *After having baby he propsed and said things were going to change for the better. He has changed in a lot of ways for the better but there are QUITE a few things that still causes ALOT of problems between us.* You really need to ask yourself are you really for someone like this? I think that will give you a better idea weather to go through the wedding or not.