think
She blushed to think how she had ignored his advice.
He blushed to think of how shamelessly he'd paraded himself when he'd had Judith on his arm.
I blush to think of the tall gates I have erected outside my home, and make a mental note to keep them open at all times.

SMART Vocabulary: related words and phrases

Ashamed and embarrassed
abash
abashed
ashamed
awkward
awkwardly
guiltiness
hangdog
have egg on your faceidiom
humbling
humblingly
mortify
mortifying
not know where to put yourselfidiom
pride
self-mortification
sheepishness
silly
smallness
squirm
swallow your prideidiom