I know it can drive girls insanely mad if they don't know whether a guy is into them or not.
We men are much more complicated creatures then we get credit for.
I get approached by girls a lot telling me they are getting mixes messages from guys they fancy and can't code whether they like them or not.
To make life easier for everyone I'm listing three sure fire ways to know if a guy is really into you.
You won't have to spend any more time wondering any more.
However, it is very important that all three signs are present.
If they are in fact present, then he definitely likes you.
Here are the three definitive signs to know if a guy fancies you:

• Questions: If a guy is constantly asking you questions then it means he is curious about you and want to learn more about you.
  The more questions he asks the more into you he is.
  The next time you are having a conversation with a guy you like, pay close attention to who is asking the questions and how often they are they asking the questions.
  
• Eye Contact: Of course a guy will have eye contact if he likes you, but you need to pay attention to the type of eye contact.
  If you notice when you are talking to him that he is starring in your eyes and you see a certain glow in his eyes (his eyes are smiling and he'll give it away if he actually smiles) then you know he is admiring you.
  Also if he checks you out, looking at you up and down then you definitely know he fancies you.
  If you are not talking to him and you notice he keeps on looking at you then it is obvious he likes you.
  You have to understand with men looks are very important, they get attracted to physical beauty.
  They don't shy from looking at a girl they like.
  However, a lot of them become shy if you catch them looking at you, they then look away.
  That means they like you.
  I bet you a few moments later when you are not paying attention, they will look at you again.
  They can't help it, it's in their human nature.
  
• Contact: The final sign to know how into you a guy is, depends on the level of contact he initiates with you.
  I know it sounds obvious but if a guy asks for your number and calls or texts you (even sends you neutral messages, like the weather is so great today) then it means he is thinking about you and likes you.
  You have to understand a number of guys are now learning how to attract girls.
  They are taught by their dating gurus to "play hard to get" and not call a girl for a few days or text her and purposely send her mixed messages.
  Don't be put off by this behaviour, it's simply a tactic to get you more interested in them.
  They sure are into you.
  Finally, the frequency of their contact.
  If after a few dates, you are still hearing from a guy and he still wants to see you, then you can rest assured he likes you a lot.
  

Above was a summary of three things you need to know how into you a guy is.