Aaron is decent but remember what Harvey Dent said to Batman and Jim Gordon in The Dark Knight, "you expect us to be decent men in an indecent time". Hahaha

Truth is life isnt just black and white, good and bad. There is always something small in-between. Jennifer needed someone that could at least not subtract from her determination because she had a lot riding on it.

I think they are both good people but might not be good together in the long run.