guy help

For a while, I had been talking to a few guys (I know this makes me a horrible person), but I met one guy several months ago and we just started talking these past few weeks and he treats me amazing. The other problem is that if the guy I really like starts dating me, I don't know how to go about breaking the news. I know someone is going to get hurt in the end, but I really need some guidance. I already know some people are going to say I should've only stuck to 1 guy in the beginning, but I really need some help on the situation