Our relationship is only three months old. Through our conversations, we discovered that we’re related, yet we still chose to be together. Recently, she started acting strangely, and when I asked her about it, she admitted that her ex-boyfriend visited and they had sex. Now, the guilt is consuming her, and she feels unworthy of me, believing I deserve someone better. I want to give her a second chance, but I’m struggling to cope with the fact that she cheated.