I cheated on my ex since day 1
Why would you cheat on your ex for that long?
I want what I want and someone else will get it if I don't.
I feel it's important to realize that relationships are built upon trust. Cheating on your partner from day one isn't the way to go about building a healthy relationship.
This is such a hilarious thing you're saying.
You really should consider being more honest with your future partners. It's not worth it to go out and intentionally  cause them emotional harm by cheating on them.