Well he's a nice guy in DH, but he totally broke Andie's heart and it's provided a lot of backstory for how Sirius helped Andie when she was crying her eyes out 24/7. So I think... probably he's a sweet guy, not anyone who's too easy to hate, but he's not the nicest guy ever, either. I can't imagine him leading Andie on so what happened probably snowballed from something small: another girl kissed him while they were dating, and then one of Andie's friends saw before he tried to push the girl away, but the other girl assumed Ted was cheating on her, and told Andie... something that he COULD be blamed for, like he could have shoved that girl away violently or something.. but also something that doesn't involve Teddy being a jackass. (: However, no matter what it is, Sirius is still going to want to open a can of whoopass on him. And, I daresay once Romeo hears the story, there will be some serious consequences if Ted talks to Andie. Romeo goes kapow on Teddy's nose.