The reality TV star had been getting on better with her former partner but says things have taken a turn for the worse after girls came forward to say he has been messaging them on twitter asking for sex, while she has been caring for their four-month-old daughter Dolly.
She said: ''Alex and I have taken a massive step backwards after we began to get on better last week.
''When he was being reasonable, I - like a fool - thought, 'Oh God, maybe he does actually give a s**t.'
''But I now feel like he's manipulating the situation to make it look as though he's making a real effort.
''Meanwhile, a girl messaged me on twitter to say Alex had asked her for sex. She's not the first - he's been asking girls to send him pictures and various other things I can't say in my column!
''Alex is single now and can do what he likes but I think his timing is a bit sick really. At 3am, when I'm feeding Dolly, it's really not the sort of thing I want to be reading.''
However, Chantelle, 29, is looking forward to moving on with her life and can't wait for her and Dolly to move into their new house.
Writing in her column for new! magazine, she said: ''I'm so excited to have found a lovely house - in three weeks we're moving in. It's got four bedrooms and a garden and it's a really nice home for Dolly. There's a lot of space, which will be handy for when she starts crawling.
''I've got to furnish it because I left a lot of my stuff at the old house. I just want to start again so I'm going to be really busy.''