What does "The victories she scored against his voracious memory were small" in the context below?

Had Dexter and Elizabeth thought of each other during this time? Of course they had, Dexter more than Elizabeth, not because of any imbalance

of affection, but because Dexter was mad about the past. He believed in it,

it sustained him, he used it to knit meaning into the mess of everything. He

recited it in anecdotes told always in the same words. He even recalled in

detail dreams that other people had had years before. Elizabeth disliked the

past. It was full of embarrassment. She and Dexter had never been in love,

but once she lay on his bed, in college, a whole Saturday afternoon waiting

for him to come back because she wanted to **** somebody and at the time

there was no-one else. She lay there all hot and impatient for hours but he

didn’t come back and he didn’t come back, and she got up and leaned out

the narrow window, through which a warm wind was blowing, and she

heard shouts from the university oval and realised he must be out there

playing cricket. She got off the bed, straightened the blanket, and went back

across the garden and through the gate to her own room in the next

building. She was cross. And she never told him about it. The victories she

scored against his voracious memory were small.

Does it mean "Dexter most of the time liked to remember his memory and among most of his memories she was in embarrassment situations "?