Seeking Forgiveness: Is It Enough to Ask Allah, or Do We Need to Apologize to Those We've Hurt?

Assalamu alaikum, everyone. I've been struggling with a question: when we wrong someone, do we have to ask for their forgiveness, or is it enough if we've already asked Allah for forgiveness? Here's my story. A brother had repeatedly promised to marry me, and both he and his mother received many benefits from me because of these promises. His mother, a single parent who relied heavily on him for emotional and financial support, initially seemed fine with things. But as our plans became more serious, she grew insecure and started resenting me. I agreed to live with her, but she treated me harshly just for being there. She bullied me about my age, claiming I might not be able to have children, and criticized my appearance. The brother never defended me; instead, he'd cry and say he was trying his best. Eventually, his mother caused a huge issue, forced us apart, and blamed everything on me. She silenced me and made him swear by Allah that he'd never speak to me again. He had made numerous marriage promises-are those now invalid because of his oath? He never apologized, and I believe he knows I didn't do anything wrong, but he didn't want to upset his mother. He always felt guilty because she raised him alone, so he did everything for her. She treated him almost like a spouse and saw me as a threat, constantly comparing me to her. It wasn't until he realized that a wife and mother are different roles, and that she was wrong to block our nikkah, that he started standing up for himself. That's why she had to tear us apart. His mother's actions and his sudden disappearance left me emotionally shattered, especially since I thought we were about to marry. I was painted as the villain for expecting him to keep his promises, which left me confused and hurt. I begged for answers, but that was used against me. His sister claimed he swore by Allah that he hadn't promised marriage at the crucial time, even though he'd said it many times, and his mother backed this up with another false oath. I never got any real answers. After months of reflection, I think he's too entangled with his mother, and I overlooked the warning signs. I want to forgive him, but I feel he needs to show remorse. He never apologized and instead made me out to be the bad person just to please his mother. What should I do? Is seeking Allah's forgiveness sufficient in such cases, or is an apology to the person necessary too? Jazakum Allah khairan for your advice.