When I say, 'The One', I mean that he wasn't the one I could have a future with. He was, however, the one guy who made me realise that sometimes we're so blinded by our attraction towards someone because of how different they were before the start of the relationship that we don't expect them to be the vile human beings they turn out to be as the relationship progresses.
Sure, there were many red flags throughout the course of the relationship but it wasn't until after it ended that I finally got to really think about them and begrudged disregarding them in the first place.
The signs proving that a guy isn't the one are pretty universal, if any of these apply to your guy in particular way then I advise you to end it now or else you'll have some sort of resentment.
1. Thought that cheating wasn't a big deal
My ex always used to laugh his ass off whenever some of his friends told him of their cheating stories. I never found them to be funny at all, in fact, I thought of them as completely revolting as to how it's even humane to take pride in deceiving someone because later on, those same friends would act all loving with their 'main' girlfriends. It made me sick, it annoyed me when my ex just laughed and told them that they were so very 'clever'.