Rebound or returning home

hi guys, my story is very interesting(to me per se). So, i was in a relationship and have a daughter already. We were together for a year and change and we already have a daughter. Crazy right? I guess if we listen to our genitals instead of brains a reason the unexpected happens. But anyway, I went to the US for internship and then I met this girl. We hooked up got married had a baby and end up staying in th US. Fast forward 5 yrs. Came home 1 night caught her talking to a guy I confronted her asked her if she had sex with him she said yes many times. Ok divorce is already set. So I begane talking to my ex that I left and she forgave me right away and before tou know it we were saying I love you to each other. Now I'm so we have a repationship already and I realize that she is not the same anymore. The demure version went out the window and her wild side is just peeping. Sometimes I find myself doubting intentions and I keep on asking why so soon? If my wife would beg me to take her back I wouldn't even listen and keep walking away. But my emotions was so fragile and my mind and soul was damge due to my wife's infidelity so here I am the poor boy whose psychologicaly and emotionally damage needing assistance and here comes the ex to save the day. If ever my ex and I get back together and take it one step further my biggest fear is revenge. I fear that she might justify me leaving her and exploit my weakness. I fear that this is all a play that could either have a happy or a very bad ending. I'm confused