Eh, I'd rather not get into the territory of the WoL forming romantic relationships with major lore characters. I didn't read into his comment as necessarily romantic, though. More like...he just genuinely wanted to sit down with the WoL and have a friendly chat free of any intrigue or drama. Given how busy both of them are, however, there's a high chance that this won't actually happen...at least not for a while. That Thancred states that it 'could be love' is likely hyperbole on his part and a consequence of him thinking of such things fairly often. Dangerously often, even.