09/11/2013 at 06:00 PM EDT
Gia Allemand's mom Donna Micheletti doesn't fault her daughter's boyfriend for leading to her shocking suicide last month.
Immediately following the tragic death
of the former Bachelor
contestant, 29, fingers were pointed at NBA player Ryan Anderson, who apparently told the reality starlet he didn't love her anymore
Micheletti says such wasn't the case, and in fact, it is her daughter's dad Eugene Allemand who is to blame.
"Right after Mother's Day, she had a falling out with her father, really badly," Micheletti recently said on the season premiere of Dr. Phil
. "She was devastated. He told her she was an idiot, she was too stupid and 'You're no daughter of mine, don't call me for Father's Day and lose my number.' That was the beginning of her end. I think it just ate her up and then she was picking on her boyfriend … I told [her dad] I blamed him. I told him, 'It's your fault. You're the reason.' "
Eugene acknowledged the argument, telling the New York Daily News
at Gia's wake, "We had a fight on Mother's Day and I said some things that I regret. I wish I could take them back, but it's too late. If she were still here, I would tell her I'm so sorry and that I love her and that she will always be my rainbow."
Combined with the issues from her dad, Gia was also apparently strongly affected by her menstrual cycle.
When she was on her period, it was "like night and day," Gia's mom says. "[Her depression] would come out of nowhere. All of a sudden, something would click in [her mind] and she would say, 'This isn't right. He doesn't love me. He's not this. He's not that' … I used to tell her, 'They're not your father. They do love you. You're just not seeing it.' "
Despite Gia's emotional ups and downs, her mom insists that her time on ABC's hit show was definitely a decision for the better.
"That was, believe it or not, the best thing for her," Micheletti says, adding that Gia fell in love with herself after that experience.