Judging Character

I'm obviously a terrible judge of character if I spent the last decade dining on lies, living as a guest in my "soul mate"/ "partners" house. It's in my best interest to remain single as I believed every word my ex said and was more than willing to grovel at her feet. Even my son suffered as he only got an hour or two of undivided attention maybe on the weekend. During the week, she'd come home from work, park it in her thrown, turn on the TV and play video games until she went to bed. Not the kind of "role model" or "other parent" you want your child to emulate. She never had the time or energy for him but she "loves" him. We obviously see parenting in completely different venues.
How could I believe the lies and omissions for so long? How can she justify treating me like dirt? Can she ever see anyone else's needs past her own? It's like she devolved into something highly unpleasant and completely untrustworthy. Do you think she believed her own lies? About how well she treated us and how much she loved us? Is that like major delusional or what?
For me, I'm lucky I got out, sorry it took so long to see the reality and forever single and unwilling to trust. I'm a poor judge of character, to say the least.