Should I end my relationship for the sake of Allah?

Salam everyone. I'm in a tough spot and need some advice. I've been with this girl for about two months, and I have strong feelings for her. We met in school a few years ago but got back in touch this year through a shared business project. Working together brought us closer, and eventually we developed feelings. She's Christian and I'm Muslim, so technically marriage could be possible, and we've even talked about it. But since we're both still in school, we can't get married for at least another year or two. At first, we planned to marry soon after graduation, but recently she said she's not sure she can marry me because I'm Muslim. I don't know if that's truly her belief, but it made me doubt everything. Also, yesterday she asked me to promise something, and I said "I swear to God." She replied, "You're Muslim, you don't believe in God, you believe in Allah." I know she might not realize that Allah simply means God in Arabic, but I felt a bit hurt and now I'm overthinking the whole situation. I want to grow closer to Allah, though my upbringing has made it challenging-but I feel I'm progressing this year. If leaving her brings me nearer to Allah, I'll do it, but I'd really appreciate a second opinion from someone with knowledge. I don't want to lose her.