I mean I think the fact they were having sleepovers with each other & going on holidays together etc and her professing she wanted her kids to have the same baby daddy does kinda suggest there was a bit more than friendship going on ... maybe it's just me tho
I think it was highly likely she applied for benefits / a place to stay whilst they were still together since Mila was so young when she moved out and probably wouldn't have been given a flat as quickly if she had said she was in a relationship with a man who worked full time so there has been some element of benefit frauding going on ... but who knows