RYL Forums - Relationship Advice please!!!

So, i need some advice. Me and my "fiance" have been together for almost 2 years. i made the mistake of getting engaged after 2 months of being in a relationship. and now for the past couple of months, i want out. I still have feelings for my ex, and my ex has feelings for me, and we have been talking behind my fiances back. and i feel horrible. I still love my fiance and everything, i mean i care about him, but i am not "in love" with him, i dont feel that way. and a couple months ago i cheated on him with my ex. i feel so bad. and im still doing it, i dont want to mess with his heart, but i dont want to brake it either. please help!