What do I do about this ex-friend wanting to hang out with me?

I used to be moderately overweight and now I am VERY overweight. He wants to hang out with me next week but I don't want to see him because I don't want him to know I've gotten fat. My cousins family is visiting me next week. I will be free for about 5 or 6 days after they leave, then I'm going to Pakistan for a full month to visit family and friends there. Should I tell him "I'm busy this month and next month" or should I agree to meet him and hope that he is part of the 3% of guys who don't care when a girl is fat? In 2 months time, I can lose a lot of weight. I don't want him to see me like this. I might lose him as a friend.
What do I do about this ex-friend wanting to hang out with me?
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