Kissing, touching and intimate language. And ofcourse the more serious like sex.

Wanting to be intimate with someone else... emotionally, intellectually or physically. You owe that part of you to your partner. You owe the best of who you are to your S/O, not the crumbs. :)

Getting caught.

It was not Love at all. Like you have changed the Q after my above answer,that is what I consider as cheating.

Doing something that diminishes or extinguishes the love between oneself and one's love. I leave this open to wide interpretation for a reason.

looking at other people- cheating with eyes flirting- cheating with mind and then theres the physical stuff. i hate the people who say you can look but you cant touch. no you cant look.

To me it is sexual contact.

In love, it's being unfaithful to the one that trusts you! In playing games or sport, it's attempting to gain an advantage by being dishonest.

Cheating is a whole complete thing. It doesn't really only start in the physical. All thoughts cause results and reactions to those results. Therefore... technically... If you have cheated in your heart with the intent to follow through on the physical plane. Then that is cheating. It is the way the universe works... TO materalize something you want. Simply requires a concentrated desire based idea. Intent is everything. Thinking something isn't cheating, thinking something into being... is. Kissing is tricky... It is usually where and when you find out if you want to continue. Sometimes it is cheating and sometimes, it's just the end of something that shouldn't have happened to begin with. Depends on your tolerance and understanding, your morality and your loyalty. . We all make mistakes... we all fall sometimes. But I believe that here, at this point is where those morals are tested. So I don't think this is as bad as the first and the last. Physical contact is ALWAYS cheating. No matter what. It is the end result of the initial thought and it's intended purpose in the lusing in the heart. That is exactly why... Thinking it with intent to follow through is cheating. Which is also tricky... Because no one knows your intent for certain but you.

Copying off the test paper of the person next to you?

Intimate physical contact.

Doing physical (SEXUAL) things with someone else that you would not do in front of your S/O.