Many times, starting a relationship can be just as hard if not harder than maintaining a relationship. Nobody likes the thought of being rejected, after all. Sometimes the beginning of a relationship is stalled because one person isn't sure if the other one is interested. Even the most reserved "shy" guy will give you hints that he wants to at the very least go out on a date.
Watch to see if he looks at you. This may seem like an oxymoron since you'll technically be looking at him. When a guy likes you, he can't help but glance your way often. If you notice him checking you out every couple of minutes, he definitely is interested.
Pay attention to which one of you starts the conversation. If the guy approaches you or seeks you out, it means that he wants to spend time with you. When a guy likes you, he will go to you, even if it's for a simple "hi."
Keep an eye on his posture and movements when he is talking to you in person. A guy who likes you probably won't stutter on every other word or have trouble looking you in the eye. He may talk in a different tone or use words that he normally doesn't use around his friends.
Notice how many times he calls you. If a guy calls you more than twice a week, he's interested in you.
Remember any times when the guy made physical contact with you. When a guy likes you, he will find a reason or excuse to wrap his arms around you or lay his head on your shoulder. This may seem like nothing at first, but if it happens more than once or twice, it's a sign that the guy likes you.
Use mutual friends (if you have any) to learn whether the guy likes you. If he does, he will bring you up to your friends. He may not ask if you're dating anybody or what you're up to this weekend. Instead, your name may just happen to come up in conversation often. If that is the case, it's a big sign the guy is interested. Be patient with the guy. Many guys have trouble expressing their feelings.
Never play "hard to get" with a guy. It annoys them and makes them believe that you aren't interested or are too "high maintenance."