I wanted your help because I think I'm either overthinking with my head or with my dick.

I have been on an LTR for around a year, im 22 now, and things have been considerably good. Submissive girl, does her best for me yada yada, all the 9 yards.

But the relationship has grown kind of stale lately and a couple of opportunities have appeared. One of them is a ex plate of around a year (I dropped her when I got into the ltr), after she reached out with a birthday text. I am very intrigued on the cheating aspect after listening to Itswr1tten on the "Meet the EC's" on YouTube, plus I feel like I need something "new", but I don't really want my ltr finding out because we are in a good place right now and I can picture a scenario where she does, probably because I'm a pessimist by nature, so I came here to know what your thoughts are on the matter, if this should or not be a no go. And if so, how so