I've had it happen to me plenty of times that I'd have a crush on or fall in love with someone, then eventually those feelings would turn into a sibling-like kind of love and the attraction would be completely axed, but that included both sexual feelings and romantic love. So when it happens only to one aspect of it, that's certainly unexpected, for me at least.
Are you still intimate with your boyfriend in any way? Do you feel the desire to kiss him and be romantic with him, even if you don't feel the sexual attraction? Conversely, when you're not in a relationship, do you normally engage in casual sex without any romantic attachment and actually enjoy it? If you have complicated feelings about sexual attraction in general that could be the source of this, but otherwise, if it truly only happens after you've started a relationship, and the romance is still there, then I'm not too sure.
Thanks so much for your response…
I do feel the desire to kiss him... and we are romantic with one another... and I love him more than ever, and am still excited with butterflies when I see him... and he does want to have sex with me like, all the time... but when I do have sex, it feels like it's a scheduled chore and that's the only aspect of our relationship that is a problem... hence we have been in an open relationship for the past 3 years - but it's a strong one and we are very connected/compatible/happy.
Since the romance is still there, I guess I'll have to accept that you are "not too sure" about it... lol... but thank you so much for your time and reply 😃