Navigating Long-Term Relationships as a DID System

Is it difficult for other systems to date, or be in serious, long term relationships with singlets? Like, is it difficult for your singlet partner to tell when you've switched, and to which alter you've switched to? Mine often tells me he cannot tell when it's me, my little, or my other alter. Is there any way to make it easier for them to tell who is fronting? For us as a system to tell who is fronting? Any advice is welcome!