1. I am happy with you.

2. I am happy because of you.
3. I am happy about you.

(What does #1 mean? Does #1 mean #2 or #3?)

#1 generally means I approve of what you're doing. It can also mean "I love you."

#2 means that "you" makes "I" happy because of actions and expressed love. It might also mean that without "you," the "I" would be unhappy.

#3 means the "I" is happy because of something "you" has done or achieved.

They're all generally similar, but not identical.

The phrase "I am happy with you" (#1) means that the speaker is pleased or content in their relationship or interaction with the person they are addressing. It expresses a positive sentiment towards the other person.

On the other hand, the phrase "I am happy because of you" (#2) suggests that the speaker's happiness is a result of something the other person did or said. It implies that the actions or presence of the person has positively affected the speaker's mood.

Lastly, the expression "I am happy about you" (#3) is less commonly used and can have different interpretations depending on the context. It might convey being proud or delighted about the accomplishments or traits of the other person, or it can simply indicate general satisfaction or positive feelings about that individual.

In summary, #1, #2, and #3 convey slightly different meanings. #1 focuses on the relationship or interaction, #2 highlights the impact or influence of the other person, and #3 could encompass different aspects such as admiration, pride, or general satisfaction associated with the other person.