Holden has a deep respect and admiration for Jane Gallagher, he has an emotional bond with her since they lived near each other in Maine while they both occupied vacation homes. They lived next door to each other, and Holden became friends with her.
"Jane and I got to be friends and all. I played golf with her that same afternoon. She was the only one, outside my family, that I ever showed Allie's baseball mitt to with all the poems written on it." (Salinger)
Jane and Holden bonded over their shared pain, Holden feeling grief over the death of his brother Allie, and Jane struggling within her family with an abusive step-father. He had romantic feelings for Jane, and felt very comfortable with her.
"Jane was different. We'd get into a goddam movie or something and right away we'd start holding hands and we wouldn't quit till the movie was over. With Jane, you never even worried if your hand was sweaty or not." (Salinger)
Apparently, Holden did not keep us his communication with Jane because of feelings of inferiority. Holden puts Jane on a pedestal, she is a good girl, his dream girl. Yet, even though he feels deeply for Jane, he doesn't call her.
Holden does not care that much for Sally Hayes, yet he feels less anxious about calling her. He opts to call Sally when he is in New York, because he is desperate to talk to someone, to see someone that he knows.
When Holden sees Sally coming towards him, he feels very emotional. He admires her good looks.
"I felt like marrying her the minute I saw her, I'm crazy. I didn't even like her much and yet all of a sudden I felt like I was in love with her and wanted to marry her. I swear to God I'm crazy." (Salinger)
Even though Holden is physically attracted to Sally, she does not have the depth of compassion that Jane has though and Holden can't seem to get Sally to understand how he really feels about life. She gets really frightened and angry at Holden's attitude, and suggestion that they run away.
"Holden asks her to go away with him to Massachusetts or Vermont. She refuses, pointing out that they are much too young to set up housekeeping together and that college and Holden's career come first. Holden doesn't want to hear about a traditional career. He becomes angry and tells Sally she's a "royal pain in the ass." She "hit the ceiling" and left."