How much do you worry about your significant other cheating?

I have been cheated on in the past. It was the most devastating thing that has ever happened to me. I feel as though I can’t handle it as well as other people. I am complete disaster after and I am so hurt by it that its hard to explain with words. I always wonder how people take back their significant other after they caught them cheating? I also cant get out of my mind that almost all men cheat. I just want to be happy and feel safe but I feel it to be almost impossible to feel that way. I feel like no one I know worries nor gets as hurt as I do when being cheated on. I am a train wreck and I am worried that it is going to happen to me again. I am currently dating someone new and he has done nothing to make me worry but I find myself thinking about how I would feel if he were to cheat and I’d die. I feel like I wouldn’t be able to handle it. Can anyone else relate to how I feel? If so, how do you overcome these feelings?