Rekha is looking for this one! Holy moly I either remember this one, or it’s been a reader question in the past. But GASP!!!!
She asks:
I need help with this book I am looking for.
Heroine is best friends with Hero and falling in love with him. But her elder sister makes moves on H and during a video call with said sister h sees hero in a half dressed state in the sister’s apartment.
H gets sister pregnant. I think they marry (not sure) and have a kid, then the sister abandons both H and her son.