๐Ÿ’• vs ๐Ÿ’– โ€” two hearts vs sparkling heart

Two pink hearts (๐Ÿ’•) and the sparkling heart (๐Ÿ’–) both express affection โ€” but they feel different.

two heartsU+1F495
sparkling heartU+1F496

Verdict: For relationships and togetherness use ๐Ÿ’•; for crushes and cute excitement use ๐Ÿ’–.