Melissa Howe was first linked to the footballer earlier this month, when it was reported that she and twin sister Carla paraded outside their home, competing for the chance to spend the night with him.
Melissa was selected and driven to the Surrey home Cole once shared with ex-wife Cheryl. On Friday night, he asked her to move into the mansion, but she refused his offer.
"When he asked me to move in with him I was taken aback," she told The People. "I told him he'd have to wait a little while and he took it quite well. We haven't even had sex yet. We've done other intimate things, but not everything.
"I don't want him to think I'm one of those girls who just jumps into bed. And it's a bit too soon to be moving in, to be honest.
"Ashley is really good looking and has a good body. He seems like a really nice guy too. I think he is pretty besotted and things could get serious. But I'm only 21 and I'm making him wait."
Melissa said that his home had no belongings or pictures of Cheryl and that Ashley confessed the singer wouldn't take him back, despite reports suggesting otherwise.
Last week, Cole took Melissa out for a Chinese meal before the pair went back to his house and got into his Jacuzzi. "We weren't naked," Melissa insisted. "We waited for that until we got upstairs."