In one sentence, describe what the following article is about:

The longer your interactions with a guy are kept casual, the more likely his feelings are to be caught up by someone else. When you meet a guy, there is a charged momentum, and catching the wave can mean everything when it comes to stealing his heart away. Keep in mind there is a difference between openly admitting "I love you" and simply making your attraction apparent. Flirting can say every bit as much, especially if it's mutual and the right chemistry is there. Once you've introduced yourself to a guy, you should already have a decent idea whether there is something there worth exploring in greater length. The question, then, is to figure out whether he feels the same way already. Common signs can include whether he's introducing you to his friends or opening up about more personal topics. If he's not doing this yet at this point, it doesn't mean he's not interested, nor does it even mean you don't have his heart already. Certain guys express affection differently than others. If mutual attraction is already there, openly discussing personal things, whether they are painful experiences or insecurities, makes the connection feel more important and real. Being personal and candid about your feelings shows a longer-lasting commitment between the two of you, but it's only truly meaningful if the exchange goes both ways. If the guy you're interested in doesn't have an easy time talking about his feelings, it's best not to press it. You should let him know you are there for him whenever he feels the need to talk about things like that.  State your intentions about wanting to grow closer if your partner is confused as to why you're approaching him with touchy subjects.  It is more important for you to understand rather than be understood. Especially at first, guys tend to be more closeted about their feelings. In time, he'll find it easier to open up to you. When you're making an earnest attempt at winning over a guy's heart, it pays off to understand that men interpret and demonstrate feelings in a much different way than women. If you're getting frustrated the guy isn't showing enough feeling, it may be because he's been more conditioned to hide the way he feels than you have. Whatever the case may be, it is important to be patient in navigating the differences between male and female psychologies. Chances are high he is feeling just as confused about the way you act.

Summary:
Let a guy know you're interested early on. Look for signs that he wants to get serious with you. Open up about personal matters. Acknowledge the differences in male psychology.