Those are the seat numbers, but that can change. It's not really how much someone weighs, it's how wide they are, and the be honest, judging by that photo there's no way that your FH can fit into one airline seat without pretty seriously spilling over into the seat next to him to to his width, and you do'nt really have the space to let him take some of yours. I don't think that losing 20 pounds is going to help in that respect. I can't really see how wide you are, but my guess that you'll be spilling over into someone's seat a bit as well.
You have the center and aisle seats on your flight, so one of you can lean into the aisle for most of the flight, but you need to do everything you can to not enter the space of the person in the window seat, and be aware that if that person complains that you are infringing onto their space, one of several things could happen.
You could be required to by a second seat for each of you on the spot. You could be deplaned and require to wait for another flight thta had enough empty seats to accmodate you. Or one of you might be moved to another lpace on the plane so you won't be seated together, but you would each ahve more space.
As a reference, I've met MushyMushy in person, and she's quite a bit smaller than you--at least from what I could tell from that photo. So use that information with her post as a comparision.
Anne