I don't think anyone comes back...I think its just the F2.
The F2 (Ed, if I have it my way ;P) proposes to Jill and he reminds JIll that he wants it to work, and he proved it since he came back for her. This sends her on a guilt trip because she does care for him and more importantly, she can't deny that he has returned "for her". Therefore we see JIll speaking to CH about how she's not sure what to do because maybe she should give him a chance. But CH has said that JIll sticks to her guns...so in the last 5 minutes we might think that she's so confused she just wants to call things off but then she comes to her senses and realizes that Reid (yes, if I have it my way again) has shown all along how much he cares for her, he has been patient, funny, and has really made her "happy" throughout this process (her word not mine--).
I think in the end Reid gets his eskimo.