"sex diminishes"
"stops looking good"
Oof. Time to go. Always keep your girlfriend on her toes.
You let her get comfortable in the relationship, if you kept her guessing about "wow is he gonna leave me if I stop doing xyz" and you make it clear that you will. She will not stop doing xyz. If she made it okay she looks like garbage every time you see her, then thats on you man. My girlfriend can wear whatever she wants in her house, but when we go out, she always dresses well. We've been together for 3.5 years. Sex is also on you, if you wait for her to initiate it, she won't. Why would she? But if you get her going and keep her guessing, she will get wet every-time, and beg you to **** her.
Guys drop frame in relationships, why? Because of comfort. I wouldn't be surprised if she was looking at other guys because she finds the relationship boring too. I see guys gain a hefty amount of weight in relationships (not good weight either) or dress like sh1t when they go out. Is this you?
I know it's easy to get into a groove where you're doing the same thing over and over again, but once you snap out of that groove and be spontaneous again, like when you first starting dating, your relationship gets fun again. Ruts happen, but they don't last and shouldn't last.