Well all this speculation is super intriguing...
I think I'm on the boat of people who think the "Maker" did not really LURVE Andraste. That's just something I think the writers of history over the years got wrong. If the Maker only visited Andraste in her dreams, there is suspicion enough to think that Solas maybe was the one visiting her, but only to give guidance and kind of push her in a direction that would change the world. Maybe he let her think he was the Maker so that she would actually go out and effect change in the world. That actually kind of sounds like something the Dread Wolf would do...try to help but not in an obvious or best way. I'd be on board with finding out that the "Maker" that was guiding Andraste was Solas...and even if that is the case that doesn't mean the actual "Maker" doesn't exist. It would just mean that what Thedas thought the Maker was actually wasn't. Which kind of would make sense with how they've all twisted their own history through the years.
In all, regardless of speculation, I don't believe that Solas loves anyone other than the Inquisitor...he may have had feelings for others and had other relationships, but I'm going to continue believing that his one and only true love is the Inquisitor. TEAM OPTIMISM 4 LYFE