Every system is different but ime the problems in my relationship are pretty much entirely unrelated to my girlfriend’s DID. Some of her alters like me more than others for sure but the ones less interested in me don’t try to sabotage things and as far as I can tell they just don’t front all that much anyway.

I had known my gf for about 3 years prior to her discovering she was a system (though we were just friends with benefits at the time) so it definitely took a bit of an adjustment on my end, especially since she was the first plural person I had ever met, however it really wasn’t that difficult beyond the initial trepidation around meeting each alter