Am I scared my boyfriend will cheat on me because I've cheated in the past?

I have never cheated in this relationship and I never would.

But, every relationship I have had previously, I have cheated. I cheated because I wasn’t happy, wasn’t in love. But now I am very happy and very in love.

I am paranoid all the time, I am just thinking that maybe it is because I have cheated in the past.

Would this explain it?