A broken heart is what happens when a love relationship is broken off.

Someone with a broken heart is usually depressed, which means they feel awful and don't enjoy life.

To fall in love with someone can be a wonderful experience with powerful emotions.

People in love often share their deepest feelings and emotions, which is intimacy.亲密; 亲近; 亲昵的言行; 性行为;

To find someone attractive usually means there is a  physical desire to be with them.

Physical attraction may sometimes lead to love, but in many cases they may only lead to a short-term sexual relationship.

(Many women use makeup to make themselves more physically attractive.)

(Physically attractive people attract people of the opposite or same sex, depending on their sexual orientation.)

To flirt with someone means to let him or her know that you want to be approached.

Some people use their eyes or smile to flirt.

(The skill of flirting is something that comes naturally to some people, but for many people, they just act awkwardly.)笨拙地;尴尬地;

Jealousy is what happens when two people compete for the love of the same person.

The one who loses may become very jealous of the other, and try to break things up.

(Feelings of jealousy may last for a long time and can destroy friendships.)

(When you are in love with someone, you can hardly think of anything esle.)

(A jealous person often wants to possess the person they love.)

(If someone is firting with you, they are coming on to you.)

(If two men are rivals for the same woman, they may dislike or even hate each other because of jealousy.)竞争对手