<human>: Give me a shortened version of the text

In short, I've been in 4 relationships including my current one. My first 2 were cute short by the other as they had both cheated on me and were caught. 

I was unable to be at ease with the third relationship unless I was with her, basically. We broke up later because of how overly worried I became.

I'm now in my fourth relationship and REALLY do not want this to happen again, but I can't help it. It's just my gut feeling. In NO WAY does this girl seem like the kind who would do ANYTHING of the sort, but my mind keeps playing scenarios that end like the past 3 relationships. 

Does anybody have advice on how to calm nerves in this sort of situation?
<bot>: First 2 relationships ended because they cheated, third ended because of my paranoia of her doing the same. How can I not let that happen to me on this, the fourth relationship?