It's probably not over. According to your profile, you two started dating at age 18. Not to sound cliche' or anything, but sometimes having a relationship very young, such as you two, one person grows faster than the other, not at the same pace as the other. In my experience, a 4 year relationship doesn't completely end in one day. Call her tomorrow and ask to talk about things, by phone or preferably in person. Not a texting conversation for this. Really listen to what she says, don't argue back right now. She may still want to be careless and reckless, and that is certainly her right to be that way. She might not be ready to settle down with a family at this time and you can't force her to do that (to "show she loves you" as you said).

Just talk to her, listen to her. I don't feel it is over, yet. Good luck and let us know how it goes.

You need to live for yourself, not for anyone else. You need to take action for ensure your success and future is strong and promising.
Let her join you in the journey or let her go, its her choice not yours.
Love yourself for your strength, spirit, goals and dreams.
You need to be healthy for yourself. She needs to be healthy for herself not you.
IF she want to go don't stop her, don't beg her, don't guilt her. Doing any of these will show yourself as weak and needy.
At your age you should have a bucket list, life goal list, ambition list at least 100 items long, now write them down and write them down in a fashion like, "I will travel to France", no wants or needs.
Stop asking her to show you she loves you, stop telling her to give the same amount you are giving.
Let her come to you on her terms, you must live your life and be your own person, when you are yourself a woman will love you for you.

All the blood, sweat, work, and living healthy only makes you a better person. You have to do it for yourself. You did it and are doing it. Keep it up with or without her. Believe me, there are plenty of us that don’t feel like doing that anymore. We don’t have the energy and feel dejected after our breakups. Keep it up! You have a whole life ahead of you. It makes you more desirable to others. When she is ready to settle down, it might work in the future. I can only wish I was in your shoes. My situation is way worse. You are good. Work on having a strong mind to overcome the emotions. You will be fine and one day look back and think this is silly. I am not trying to make light of your situation. Believe me from experience. Good luck, stay strong.

Deep Breath.

With or without her...you have a full life ahead of you. As GirlinCalif said, call her tomorrow and listen.

Big hugs, I know that it hurts like hell, Patti

Great advice here. The only thing you can control is YOU. We all go through the phase of early stages of relationship, emotions, careless ness. Selfishness. The chase etc. that will fade. It will no matter what we do. You have to keep that confidence the more you beg the more she sees insecurities, they don’t want that they want a person with drive and a future they can paint and see theme selves in. Take care of you do things you enjoy and lost when you met her. We all do it as men. You’ll make it through trust me. The hurt is there but you can do anything you want to do.