I think they should cause they are just perfect together, deep down they both know they still amor each other:) Tara and Ben just dont work he is sweet but just not like tara they wont last!
Christian - “He wants everything, I mean he wants Tink because she is awesome, she’s always there for him when he needs it. But I think deep down Peter loves Wendy,” Zach - “Why’s that?” Christian - “Because she challenges him to be better than he is. You know? He is scared of that so he gives her up, kind of makes him a sell-out”.
Actually if you check Their characters Wikipedia it says that Christian is Tara's boyfriend. So even though it doesn't show that they are together in the last episode they actually are.