What does tom unexpectedly discover as he passes Jeff thatchers house?

As Tom passes Jeff Thatcher's house, he unexpectedly discovers that Jeff is hosting a gathering with friends, and he sees Becky Thatcher among them. This realization stirs feelings of jealousy and longing in Tom, as he yearns for Becky's attention and affection. The sight of her laughing and enjoying herself with others deepens his sense of rejection and heartbreak.