A New Year, A New Me: finally got the reason why boy doesnt like me....and my meal plan for getting him haha

I was hanging out with my best friend who I've been in love with since grade 10. So like 7+ years I think. Well we've always hung out and we were happy....then he asked me to be his girlfriend and I was in heaven but it didn't last long since he said we wouldn't work out, gave no reason at all. We both like each other and everyone thinks we will end up together but for some reason we never last when we say we're dating. So, Saturday I go over we're hanging out with the guys (yes my best friend is a guy) and then it's just us and we start talking about whatever, then came up the subject about if he was sleeping with someone else I would be mad, yes I would be I can't tell him that haha. Then I tell him that I've already got it thro my head that we won't be together and that I am trying to move on....tho clearly I am not since I think about him still. He's like you have a great personality and you're the nicest girl and we get along great but there is a reason why I can't date you....I was like ok say it he said hed sound ignorant....and then I knew where it was going. He finally tells me why even tho I had figured it out. It's cuz Im FAT. he didn't actually say fat he said someone who is bigger. He is fit so he wants someone that takes care of their body.....and that's what Im trying to do is loose weight by any means.

Is it silly for me to loose weight because of him? I want to do it for me yes but more so for him....So my plan is to not see him for a month and for me to limit my calorie intake by a lot and work my ass off at the gym.

I am starting today....
my plan is

have a meal replacement shake for breakfast and dinner
eat lunch consisting of no more than 300 calories
I am back to measuring and paying attention on what I eat. I will cut out sweets, processed foods, don't use a lot of salt, and try not to snack....