In one of Andy's interviews, can't remember if it was Jimmy Kimmel or the Loveline interview, he mentioned how he made an effort to observe the other women to see how jealous they were of his time with the other women. IMO, Andy does not like a jealous or whiny girl. Bevin has been painted as both. I don't know Bevin; she might be a really great and sweet girl, but is not been shown as such. Why would Andy mention his dislike of characteristics that Bevin portrays ad nausem, if she was final one? Therefore, I believe that the final one is definitely Tessa. There is just something special between Andy and Tessa.