I suppose you could say that, but it's not the most tactful way of phrasing it. [This reminds him of more than one conversation he's had with aliens back home. Funny in retrospect how many of them don't understand love. It's almost like a tv show.]
I became involved with him while I was still in a relationship with her and I hid it. A solution like what I have now is rare; generally you're expected to just be with one person. What I did involved lying to both of them, and it hurt everyone in the end.