if someone fall in love with u and they use fo say that u are him/her only person for now and when u seems they don't have much time for you and at the same time busy with somebody else saying just casual talks, what would u feel for them?? is ur loved one is in true to you or not? how do u react to them if the situation lasts for over an year??

It's fairly common, especially among the young, for people to think they've found the one-and-only, and to make dramatic romantic announcements to each other, but then gradually discover that most of real life is made up of the mundane and boring things required to make lives for themselves.

As they learn that with whoever they made the grand loving pronouncements to, they often don't explain as they go along, that they are slowly beginning to think that they jumped into proclaiming true love too soon; instead, they become more quiet, and stop repeating the love talk, and retreat into being quiet, as they sort things out.

Lots of younger people especially, decide to start pursuing an alternative person, often not even consciously, as a fall-back, or even just as a less serious person to spend time with as they continue to figure out themselves.

In my experience, there's nothing to do about this, but accept it, and cope with the disappointment of it. It's a normal and very common learning process that a majority of humans have to go through, because no one can learn how love and life works by imagining it in advance. We all have to learn by direct trial and failure.