*cracks knuckles*
This is the thing. You can't see if a woman, or man if you bi/gay, likes you unless you like them. There is natural gathering, sexual attraction, and love attraction.
Natural gathering is how it sounds like. A man and a man, woman to woman, or one of each can get close to each other and be best of friends/rivals/ect... without the need of love or sexual desires. This is the friendship area in the gauge named "relationships".
Sexual attraction can be with any combination possible of the 2 sexes. This part of the gauge shows only the primal desires of a man or a woman to engage with the opposite, or same, in a sexual action. From flirting to full blown ***, a man or woman can show it with minimal signs to a large picket sign saying that they want to do it. This can be highly confused with Love attraction.
Love attraction is when a man and a woman, or both of the same ***, started as friends and then over the course of time gather more feelings for the person. These feelings could be sexual, loving, protecting, or even jealousy amongst the person's other relationships (associates, friends, or even past bfs/gfs). This can also be at the spark of the moment. This is mostly called "Love at first sight". This is a feeling the strikes the person that will undoubtably show great affection or slight movements to the other person's heart. This part of the gauge is very hard to notice without experience or if one is actually not getting the picture.
Signs of any of these types of relationships with the opposite, or same, *** can be any of the following:
Flirting with the person in question to gain their attention.
Sudden change of personality when the person in question is around.
Sexual movements, teasing, ect...
Trusting the person in question with secrets, or personal information that would show one's true self.
When the person in question acts upon one's feelings and tells you.
When they suddenly begin to help, hang out, or want to continue to be around you for long, or longer, periods of time.
There are many other signs that can show one's feelings, but I do not feel entitled to name all of them nor do I know all of them.
Last resort is to be up front, take it like a man (or woman), and ask/tell the person if he/she/you love the other. Love is something that many don't find, let alone at the beginning of your life. Crushes are common and can be dangerous, tricky, or the start of a relationship of your life to come. Love can hurt you, but it can also make you stronger whether it be a successful pairing or a devastating blow.
Last words of advice is Good luck, and don't be cheap with condoms. >.> Really... Don't!