You don't stop loving them, impossible to do that...what you decide to stop is letting yourself fall into despair over them. One second at a time.... claw your way back up and over, dust off and chart your course....either to repair or move on. Your love for them goes to the grave, it's just the relationship you need to figure out.
It's not you or anything you did. It never is. It's always something within the cheater that allows them to do the wrong thing even though they know better.
Whatever his reasons/excuses are, he could always have talked with you about it and tried to work on your relationship, he could have broken up with you, he could have told you he met someone else...he could have done a lot of things instead of cheating and making you hurt like this.
It's selfish. He's selfish. And that allowed him to be hurtful to you.