Why is my husband suddenly finding big bottomed curvy girls hot when im skinny?

he always said he liked my dainty petite shape but he's been flirting n eyeing girls who are much bigger than me with big booties and busts does it mean there is something wrong between us? is it a phase
Update: because i've only been observing him and keeping an eye on how he interacts with girls of same body built as me ive not noticed him flirt and until my friend told me wow he is kinda too friendly with this girl at the party that i noticed ..i never saw other body types as a risk but now i think im wrong
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