Love: Confession barriers? (and other questions)

What is it (or 'are that') which obstructs a human being from confessing love for a person of the opposite sex?

How many times have I seen a girl and a boy liking each other, longing for each other's association, flirting in the most inconspicuous ways, but yet never actually letting it out, and actually taking every care not to show it?

And why do I find, after a break-up of sorts due some ill-consequences, the partners still having full feelings for each other, but yet very reluctant to say, or finds very hard to say that he/she still have feelings for the other 'ex'?

Is it ego? Is it pride? Is it the necessity to cover the weakness? Is it out of fear of being rejected? Is it from an inner conflict questioning whether the real love (still) exists, and hence being reluctant to take the first step in case it goes wrong in future? Is it out of social insecurity of being looked upon as a 'looser'? Is it due to the need of being accepted by the 'circle' in case their match was not welcome? Is it a complex combination of some of these factors?

If its one of the above factors, is the factor real or worth it?

Is love really a weakness? Weakness is a weak point in out character due to which we might act in ways which otherwise we would never do, and which we know all the time to be logically unsound. We may say love is a weakness because we see lovers often do these kind of acts. These acts, they say, are done 'out of weakness of love'. Or are these 'acts-of-weakness' in love a mere need of our psyche, the love actually being just a subconscious justification for these? Whatever it might be, if this weakness is natural, should we consider a weakness? Hence any logic in being ashamed of it?

Err... if we follow these lines, can we say that we need not be ashamed of any other weakness of us, which we can justify as 'natural'?

What shall we consider the 'love' here to be? The platonic love, or the biological desire? Can one exist without the other? Can a line be drawn between the two?

Are there at all any answers to these questions?..........