I told my boyfriend I got syphilis from kissing and he believed my story.
Why would you lie to your boyfriend about how you got syphilis? That's a terrible thing to do.
I wanted to keep him from knowing that I was having sex with someone else.
You may be scared to tell your boyfriend that you cheated on him, however, covering up your sexually transmitted disease is hurtful to him. Be honest and take the karma that is coming to you.
It was none of my boyfriend's business. I don't like to be judged.
If you are cleating on your partner it was definitely their business. It's mean to lie to your partner and to cheat on them that way.