Why does becky choose to invite friends to a picnic?

Tom decides that he doesn't need Becky's love with his new found glory. When she gets to school he ignores her, even though she tries to catch his attention. Instead, he goes to talk to Amy Lawrence, and Becky becomes jealous. She begins telling people near Tom about the picnic she's having during vacation, hoping Tom will listen. Everyone begs for invitations to the picnic. Tom, however, just leads Amy away. Becky continues talking until she can sneak away to cry. At recess, she ignores Tom and flirts with another boy, Alfred Temple, the fancy boy Tom beat up some time before. Tom sees this and gets very jealous. He angrily imagines beating Alfred again. He goes home at noon, unable to cope with his jealousy.