Yeah, making comments like those aren't going to make her change, they're going to make her separate her loyalties from you, and you'll end up loving her yet leaving and her hating you.

Communicate in a less immature manner. What you're saying is relevant but it isn't the end of the world, also - what about you? Maybe she feels more comfortable around you because -you're- slacking also?

Go into this willing to make compromises, she can't be the only one who should be putting in the effort to make it a healthy relationship. If you're concerned about her weight? Go run with her. If you're wanting her to wear sexy lingerie? Take her shopping for it.

I don't know man. There are a lot of things you can do that don't include making her feel like crap.