Attraction
Men frequently stare at women because they are drawn to them, which is one of the main causes. When a man finds a lady appealing, he could find it difficult to look away. This is especially true if the woman is very attractive or wearing anything revealing.

Daydreaming
Guys have been known to look at ladies while deep in concentration. They might not even be aware that they are looking since they are fantasizing about something completely else.

Whatever you were doing drew his attention
If you’re doing something that is particularly interesting or unusual, a guy may stare at you simply because he is curious. For example, if you’re playing an instrument or doing a dance, a guy may stare because he is impressed by your talent.

Curiosity
Sometimes, guys stare at women simply because they are curious about them. They may be wondering what your life is like or what your personality is like.

Intimidation
Unfortunately, some guys use staring as a way to intimidate women. If a guy is staring at you aggressively or with a stern expression, he may be trying to assert his dominance over you.

There are many reasons why guys stare at women, and it’s not always because they are attracted to them. However, if you catch a guy staring at you, it’s always a good idea to be aware of your surroundings and trust your instincts.
Why Don’t Guys Smile?
When you catch a guy staring at you but he doesn’t smile, it can leave you feeling confused and wondering why he’s not showing any positive body language.

The Importance of Smiling
Smiling is a universal sign of happiness and friendliness. It can make you appear more approachable and confident. When someone smiles at you, it can make you feel good and put you at ease.

However, not everyone is comfortable with smiling or showing their teeth. Some guys might feel self-conscious about their smile or have dental issues that make them hesitant to smile.