Mmmm, as you know, I’m not a grammar Nazi (except for subject-verb agreement and active voice–you can split infinitives and dangle participles all you like), but in this case, you need to pay attention to the tense:
He thought she’d forgive him.

That’s me in the picture, btw, goofing off with a Valentine’s Day decoration.
Incidentally, if this wasn’t just a writing prompt but biography: I didn’t forgive him. My people don’t. ;P
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About mjanecolette
Writer. Reader. Angster. Reformed Bohemian (not). Author of the erotic romance TELL ME, the erotic tragedy (with a happy ending) CONSEQUENCES (of defensive adultery), the award-winning rom-com (she's versatile) CHERRY PIE CURE, and TEXT ME, CUPID--a (slightly dirty) love story for 21st century adults who don't believe in love... but want it anyway. A sought-after speaker and presenter, Colette is also the author of the Dirty Writing Secrets Series, which includes the non-fiction collection of essays ROUGH DRAFT CONFESSIONS: not a guide to writing and selling erotica and romance but full of inside inside anyway, 101 FLIRTY WRITING PROMPTS TO SEDUCE YOUR MUSE, and ORGANIZED CREATIVE. She's also the curator of the fab YYC Queer Writers anthologies Queer Christmas in Cowtown, Screw Chocolate, and A Queer Summer Night's in Cowtown. Releasing Spring 2020: CUPID IN MONTE CARLO.