I think there's a very 20th/21st century assumption that great intensity of feeling (unless the people involved are related) MUST equal sexual attraction, which is an assumption that maps somewhat poorly on actual human emotional experience. Sometimes it does! Sometimes it doesn't at all! Sometimes it does a bit, but not so much that you aren't genuinely delighted when that person falls in love and marries someone wonderful.

And sometimes intensity/attraction moderates over time. Anne at thirteen weeps at the mere possibility of her bff Diana getting married (she also sobs about how much she hates Diana's purely hypothetical husband), but when it actually happens years later, Anne is happy for her.