What is wrong with me and my relationships?

I am with someone but we have a long distance relationship. I am staying back home. I always invite woman into my life and let stuff happen because I feel pretty lonely but a strong desire to be adventurous. I really want this other person to come here but she refuses until lately. She's in university and has 3 kids. She offered to quit school and come here to live with me. She even said she would give up two of her older ones so we could work. My life with her is really dieing, she tries but Its never enough for me or barely is ever enough. I have a few weeks to tell her what we should do then I am gonna give her my choice. With our past and our time as a couple (6 years almost) I feel emotionally obligated to her. I want to dump her but I feel too attached as if she was some part of me or something. She has doubts about coming here and I don't blame her because Im not really sure if I want her here. I kinda wanted a future where we could take care of our kids but she hasn't shown me any real commitment to work or homemaking the house is always a mess and her parents are constantly pestering her about how she should care for her kids. I want someone who is willing to work instead of go to school and be a broke student and nowadays people really have to do that especially with my son and her three kids. What should I do?!?!?