It's brutally clear from the strip that Liz feels Very Insecure about the fact Anthony's getting hitched and she's still OMG!single and it's just absolutely not an option to go to the wedding alone because then it would be, like, soooo clear she's not only OMG!single, she's an OMG!single!loser who can't even get a date. Now, I totally sympathize with not wanting to go stag. I was in a wedding in 11/04 and I'd have taken a guy friend just so I wasn't going solo if he wasn't busy that day. I do not have sympathy with her burning desire to come off as "the one that got away". That smacks of ego, conceit, and profound immaturity, and her apparently baseless comment "That could've been me" smacks of Anthony, not Liz, being the one that got away. Mix it all together and what do you get? A case of spoiled little girl having a snit fit. Anthony's moved on and Liz can't/won't stand for it so she's going with the intention of shining brightly enough to take at least some of Anthony's attention away from Therese. To all appearances, Anthony's marrying an intelligent, beautiful, talented woman he loves and wants to make a life with, and Liz has the solid brass ovaries to get on her drama llama and tune up the WAHHHHHambulance siren.
Am I the only one who feels even more sorry for Therese right now? It would've been bad enough with Liz's little 'LOOK AT ME!' games if Anthony had only had eyes for Therese, but he didn't. She never stood a chance, poor woman.