Are you sure you still want to marry your current fiance? It sounds like you may be wanting to solidify your commitment with your old fiance because you feel that that relationship is currently the stronger connection. Perhaps you are feeling anxiety about marrying the "wrong man" so to speak....and I don't mean that in a negative way.
Have you given any thought to just letting the relationships move forward without the idea of offical unions? It might take some of the stress away.
And of course I could be full-o-shit