Your lack of romance options could possibly have something to do with your responses to him, the answers you give him.
Gale Romances You Like This Gale likes your character to be good... if you keep killing innocents he will hate it as he is a neutral good alignment character (in my opinion).
Have you given Gale magical items to snack on? Gale likes it when you do this.
Has Gale shown your character how to cast magic by conjuring the weave? For Gale, I think, this is foreplay.
Meeting Elminster and everything that happens at this time gives you a chance to show Gale you care about him and that you don't want him to
die.
(Remember it all depends on saying the right things to Gale. If you make a mistake romance won't happen... ever)It will be some time before Gale will actually romance you after these interactions (as far as I know), with no romantic dialogue. But one night he will surprise you.
Its like real life, romance takes time and patience....Good Luck... 