my (23f) 4-yr relationship boyfriend (21m) told me he thinks he’s bisexual

please give me advice/words of wisdom.

my boyfriend recently opened up to me that he thinks he might be bisexual. it came up during a pretty emotional conversation we were having about our relationship.

prior to that conversation he said there’s something about himself he’s been scared to tell me because he thought it might change how i see him.

the he said, “i think i’m bi.” and that when he was in 6th grade, he was sexually harassed by his family member (supposed to be older brother figure)

he told me this thought has been bothering him since elementary school, but he usually avoids thinking about it because he feels like he has a lot of internalized biphobia and doesn’t want to deal with the possibility.

at the same time, he says he doesn’t see himself having a romantic/sexual relationship with a man and doesn’t want to explore that side. he said sometimes he just finds other men good-looking. i told him that’s pretty normal lang, and that a lot of people can recognize that someone is physically attractive regardless of gender. then he said maybe it’s also because he sometimes compares himself to other men and feels insecure about his physical appearance

i asked him honestly if he thinks he might want to explore his sexuality someday. he said no. i asked if it was really “no” or just “not now,” and he said it’s really no. when i asked why, he mentioned the incident that happened to him before. so i asked hypothetically if that incident never happened, would he want to explore it? his answer was just "the thing is, it happened." he told me that this might have affected how he thinks about his sexuality and could be part of why he avoids thinking about it or feels in denial

—

so now i’m just feeling really overwhelmed and confused and i don’t know how to process all of this. we’ve been together for almost 5 years, so hearing this honestly shocked me.

but i told him that i love him no matter what and that the people who truly love you will accept you & won’t have a problem w that. i also told him he was really brave for opening up to me because i know that couldn’t have been easy.

but at the same time, i have so many questions in my head. i feel confused and caught off guard and i don’t think i’m processing it properly yet. i love him so much and i don’t want to hurt him, but i also feel like part of me might be in denial about the possibility that he’s actually bi (it’s just that we’ve been together 4–5 years and our relationship has always been very typical/monogamous)

he also reassured me a lot. he kept telling me that i’m the only person he loves and that his feelings for me haven’t/will not change. he also said that throughout our whole relationship he’s never been attracted to anyone else. he’s always been very clear that he wants a future with me (marriage, kids, all of that) and honestly, i really do feel that from him.

what confuses me the most now is how this would work long term. he says he doesn’t want to explore that side since he’s not sexually/romantically attracted to men

but then my brain keeps going to “what if” scenarios. like what if he eventually heals from that trauma and then realizes he wants to explore that side of himself? where does that leave me?

i’m not open to an open relationship (and from past conversations, i don’t think he is either). so i keep wondering how situations like this usually work for couples.

i’m so overwhelmed and don’t know how to process all of this yet.

has anyone been in a similar situation? how did you deal with it? i love him so much. i know that over time this probably won’t be a big deal for me because i love him a lot. i think i’m just caught off guard right now.

i also want to support him in any way that i can. if anyone has advice on how i can be supportive while also processing my own feelings, i would really appreciate it.