I really feel for what you've said here - this is a really tough and disappointing situation to be in.
I don't meant to sound at all unsympathetic towards your husband, but I really think this isn't
your problem. It may seem that way, since it is your own weight loss that has brought up this issue, but echoing what cherbear says, I think this is his issue and something that he ultimately needs to be responsible for dealing with.
By all means, you can support him with that, perhaps by explaining your own reasons for being enthusiastic about your weight loss, but I think this is something he needs to come around to himself. I plugged your weight and height details into a BMI calculator and you are a totally healthy weight for your height, towards the top end of the "healthy" or "normal" weight range. Him asking you to put weight on may actually tip you into the "overweight" range, which obviously wouldn't be an acceptable thing for many reasons.
As LiannaKole said, depending on what weight you were when he last saw you, a huge change in weight may explain this initial reaction. If you look really different and not like the "you" he knows and loves, this may explain his initially negative reaction. I think there's every reason in the world for him to get used to and be positive about your weight loss, and I think an adjustment period is understandable. If he doesn't get used to it, then you can cross that bridge when you come to it, but I don't think you have any reason to assume that this will be the case, since this is most likely an initial reaction based on surprise and uneasiness at the change, rather than anything deeper than that.
Also, not wanting to be at all rude about your partner since I have no idea of the context, and not wanting to sound aggressively against what he's said to you, but to me, in my relationships, you
never ask someone to change
their body because of
your preferences. In my view, it's just as out of line to ask someone to gain weight as it is to request that they lose weight. By all means, gentle discussion and openness around these sorts of issues is fine (e.g., talking about feelings and personal preferences relating to weight, talking about goals, and so on), but I think it's entirely unreasonable for anybody to request that anyone they love changes their body because they'd prefer it to be different in some way.
Best of luck with this
