Dragon age 2: sebastian romance, am i screwed?

i am in the second act of dragon age 2 and i want a relationship with sebastian. i just found out though that i cant flirt with anyone else. but before i even had sebastian on my team i flirted with isabela by accident. does this mean i have no chance? im too far in to get back to that point and reverse it. :S please help and tell me if i should even bother now or go pursue a different love interest. i hope i still can with him though :(|||You can still flirt with him, but I'm almost certain you cant pursue the relationship further due to his vow to the maker.

kauffman tire

california