Should I eat healthier now that my girlfriend went on a diet even though I'm skinny as is?

She's 5'6 135 lbs but is on this craze to get down to 120 and I told her it's her call not mine and I'm glad she is going on a diet for her benefit and happiness. She started weight watchers and is very serious about it and I want to eat healthier around her but I am actually umderweight and have a fast metabolism so I kinda live on pizza, taco bell, and chipotle. She said it doesn't bother her seeing me eat food she likes but can't have but I feel bad. She has her cheat day and on that day i take her out for a nice dinner and a couple drinks on a Saturday
Should I eat healthier now that my girlfriend went on a diet even though I'm skinny as is?
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