The reality TV star - who has a four-month-old daughter, Dolly, with the cage fighter - found explicit texts between her former fiance to another man, but she doesn't believe they mean he is gay just promiscuous.
Writing in her new! magazine column, she said: ''I found text messages from a man arranging to meet up for sex with Roxanne [Alex's female alter-ego]. I also found a text from Alex to another man, saying, 'Me and you and a bag of goodies real soon, yeah?'
''I believe Alex went through with this but I don't think he's gay. I think he'd have sex with anyone or anything if the urge took him.''
Last week, Chantelle claimed she had walked out on Alex when she was eight months pregnant after he set up a ''sex dungeon'' in the home and she found him dressed as Roxanne, and she insists she would never have embarked on a relationship with him if she had known about his unusual sexual preferences.
She said: ''I've heard that people are saying that I 'enjoyed' Alex dressing as Roxanne, but he's said in many interviews that Roxanne was never part of our relationship.
''I came home from a night out in London in May to find the house turned into a sex dungeon. Alex was dressed as Roxanne, there were dildos strapped to every bed in the house, there was porn on every TV, all the blinds were closed and there were sex toys everywhere. I left and slept on the floor of my flat, despite being almost eight months pregnant - that's how much I 'enjoyed' Roxanne.
''If he'd told me his sexual preferences at the start, I never would have been with him. He ultimately took a decision away from me that shaped my whole future. I hate him.''