My boyfriend (22M) has expressed that he wants to remain celibate until marriage because of his Christian beliefs, but we still engage in sexual activity occasionally. Any advice on how to navigate this situation?

My boyfriend [22M] and I [20F] have been in a relationship for nearly two years. At the start, we were intimate frequently, and I thought we both enjoyed it. However, about a year in, he found religion and decided to dedicate his life to Christianity. I’ve always supported this choice, even though I've never been particularly religious myself; I believe everyone has the right to choose their own path. Recently, he expressed a desire to stop having sex until we get married because it makes him feel "extremely guilty." Although I didn’t want this change, I respected his wishes out of love for him. However, despite his stance, he still occasionally engages in sexual activities with me—like allowing me to perform oral sex or having full intercourse. Afterward, he often seems off, even though he’s admitted that these actions conflict with his beliefs. I truly love him and don’t want to end our relationship, especially if there's a way to address this issue effectively. I’m left wondering why he continues to act this way. When I ask, he says I make him "weak." Yet, I can't shake the feeling that I've done something wrong or led him to sin. I really need some advice on how to navigate this situation. Any insights or shared experiences would be appreciated.