I want to ruin my recent relationship by cheating. The guilt is making me feel like dying.
What do you mean when you say you feel like dying?
I'm very anxious and I am crying all the time.
It sounds like you feel very bad about your thoughts about cheating on your partner. It's good that you feel bad, but it's very important that you don't follow through and actually cheat on them. Cheating would ruin your relationship and hurt your partner.
You're right, but these urges won't go away.
I'm glad that you agree that cheating is the wrong thing to do. Many people have thoughts of being with other people from time to time even when they are in relationships. That's not unusual, but it's important not to act on those feelings and to instead remain loyal to your partner.