Is a normal part of life; it protect us from harm and warns us to take action.

The answer could be, "Our Bodies." Although I'm not sure because the question is more of a riddle than a question. ;)

Anxiety is an unpleasant state of inner turmoil, often accompanied by nervous behavior. Although anxiety sounds scary, it’s a normal part of life.

Explanation:

Anxiety is the answer. (D)

if your boyfriend is cheating on you, my best advice to you is to dump him, he's only going to drag you down. and if you do, don't fret there's plenty better that know how to treat a person right. i mean honestly, the whole point of a romantic relationship is love, and if you love someone you aren't going to cheat on them. i do believe in second chances, but why would he cheat in the first place? i personally feel that if someone cheats, they ruin any chance they wanted/had with you. i wish you the best of luck with this, hang in there.