but he does know what she will become while she doesn't he can use that as blackmail I mean she does own him if it wasn't for him she wouldn't even have met Ronnie. He could show her what her destiny is and say would Ronnie still marry you if he knew you would become a cold blooded killer? Eobard doesn't do anything unless he gets something out of it he may have saved Ronnie but he didn't do it out of kindness he did it for a reason. Really I find Ronnie/Firestorm boring along with Snowstorm when I saw those wedding pics with no Eobard I was like boring then after the wedding when I saw the prisoner transport truck which may be for Eobard I was like now that's more like it!