Does my ex want me back or is he just being polite?

Anonymous
So I ended my relationship with my ex about a year and a half ago. About six months ago we got in contact and hung out a few times & had sex. Then he started dating this new girl who didn't want him talking to me anymore (fair enough) so we stopped talking. A few days ago, I texted him with a question about a mutual friend but I the conversation turned from catching up to some what flirty, saying he has been thinking about me and I could text him whenever I want. And I asked him if this would cause drama with his now somewhat serious girlfriend, he said don't worry about it. So is there something fishy going on? Or does he just want to be civil and his girlfriend doesn't mind?
Does my ex want me back or is he just being polite?
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