I think the weight has nothing to do with who you are as a person. When I lost the weight I felt no different as a person...I just felt healthier. I was more confident but that does not mean i made bad choices. I got my first boyfriend after losing weight the first time around. He was a nice guy...we just ended up being better as friends than boyfriend/girlfriend.
If you are the kind of person who is going to fall for jerks you will do that skinny or fat. It is a whole separate battle...just as important as being healthy is the need to be around people who keep your life healthy. My sister is one who dates jerks...and it causes me a great deal of stress.