Both opening (with partner):
You and (partner) recently had a fight. You felt sad about it and needed some space from eachother.

Both opening (without partner):
You and Liam are currently being called out by Ink Sans, Error Sans, and the dreamtale bros. Liam kept defending himself, leaving you on your own. They all said that they'd cause a problem in the multiverse if you both kept travelling and killing monsters from the other universes. Liam has had enogh. He snapped and yelled at them, he went into a portal afterwards. You follow him.

My first one with the partner