Lets say

I would never go back to an old lover if I was with another. That would not be a loyal thing to do. My new partner would always take importance over the former. Otherwise, why did you leave it? Also, the old lover may be trying to mess with yur head making you think that he/ she wants you and yet....

I probably will stay with the present one. I don't go back to the past. If he's my ex he will be my ex forever...I will be loyal to my partner, no matter what happens...

i would say with the current one. when i have broken with the ex, it was still ok to again be with him. if i was not into any relationship. it would be cheating to the current one.

I would stay with my fiance. My last ex was a jerk, and even if he wasn't, I wouldn't do it. There's always a reason why you stopped dating that person, and going back, would just prove to be stupid. Stay with the one that you love, not the one that you used to love. It's as simple as that.

i would stay with my present girlfriend because i dont go back out with my ex's thats how its always been..