Friends with someone more hus type

My boyfriend was always into curvy womrn with big breasts and asses. I'm the exact opposite. Super skinny. Super flat. No ass. One of his friends came down to visit. She is exactly what he's into. Curvy, big ass, big tips. They hadn't seen in other in a year because she decided to move states so she could go to a school. Them hugging made me super uncomfortable. She has a kid(boyfriend does too) and they let them hang out. His son was telling her how pretty she was and saying "I like you!" I get I shouldn't need approval from a 4 year old, but it still hurts because his son has never complimented me once. When I brought it up to my boyfriend be said I was being insecure and that his son most likely is attracted to her hair(it's colored). Am I just insecure? Should I just let it go?