Most Helpful Girl
Ummmm yes? What kind of a question is this? Unless you automatically decide you don't like her anymore because she's not as skinny as you'd like, yes, of course you should still love her.
Most Helpful Guy
Well that's your choice eventually and plus there is a point here, I am sure you know the difference between love and attraction? although I must say love and attraction are related.
Hence it's possible for you to love your girlfriend even if she is fat but then you might not be attracted to her and if you think/feel that there is no point in loving her without feeling any attraction towards her then it's your choice. On the other hand it's possible for you to love her despite her appearance hence both are possible, it's your choice in the end.