You make it sound like it's an either/or situation. Can't you tell them both about what's happening, and ask if they would be ok with you having them both as partners?

I think a lot of problems in the world are caused by too much either/or thinking. I tend to believe in more and/and.

'Either you have the whipped cream on your icecream or the coloured sprinkles.'

Why not have both? Or am I being too idealistic?