Why did the poet get more fascinated with the second road than the first one in "The Road Not Taken"?

The poem's speaker is walking in the woods when he comes to a fork in the road. He looks each way, thinking for a long time about which path he should take. Finally, he picks the one that was "grassy and wanted wear."
In other words, he picks the road that has more grass on it and is less worn down with human footsteps. It is the road that fewer people have walked on, and this aspect of it attracts him. He prefers to go where not so many people have been.
He says at the end of the poem that he took the road "less travelled" and states that this choice has made all the difference to him.
The poem's fork in the road is often taken as a symbol for a place in our lives where we have to make a decision. This speaker made a less conventional decision and is happy he did so.