The great late Sam Kinison had the same problem...he once said, "I love women, my record proves that. I bite it every fuking time. Each woman said that she was 'new love' and not like the others, so I take her home and once the door is closed, it's not the door to heaven, but the door to hell".
I finally got smart, been single since 2004, had some gals come and go since but never got paper involved again. Latest gal is on her way out, she moved in a little over a year ago and said she had no debt. Now she has 10 credit cards maxed and shut down and had to file bankruptcy. Oh, and in the last year, she put on 25 pounds of what she calls "relationship weight". Good times. She's packing as I type this.