I'm a 32-year-old woman and I'm questioning my boyfriend's sexuality, who's 30. I'm uncertain if I should end the relationship.

My boyfriend (30M) often shares his fantasies about being with other men. While he reassures me that he's in love with me and we generally have a wonderful relationship, I can't help but feel concerned. Our sex life is satisfying, we communicate openly, and we're both willing to explore new things together. I truly believe this could be a lasting love, but I'm worried he might cheat on me, come to terms with being gay, or develop resentment towards me for not wanting to open up our relationship. I want to be supportive of him; I understand that everyone has different thoughts and fantasies, and that doesn't necessarily mean they need to act on them. Just like many straight guys might fantasize about Instagram models or consider threesomes, that doesn't mean they will pursue those experiences. I don’t want to end our relationship over this issue, especially since everything else is going so well. However, I do realize that love alone might not be enough. Is it possible for us to maintain a monogamous relationship even if he desires to explore sexual experiences with men as well?