I've cheated on a partner once, just kissing and it was back when I was a teenager so I don't really count myself as someone who would cheat because it was back when I was young and was figuring out relationships and myself.

I have however, been with people who were in relationships at the time. Two of these people I knew were in relationships, one was again when I was young so I don't feel bad about it now. The other was more recent and I absolutely hate myself for it, there's no excuses. All the others, I stopped all contact with them as soon as I found out they were in relationships.

Despite that, I definitely don't think everybody is a cheater. I don't even think I have trust issues when I'm in a relationship.