What to do after a bad fight?

Hello all, so I have been dating her for 4 years. Just like any other relationship we had our up and downs. But recently she really lost it on me because she thinks that in 4 years we should've perhaps upgraded our relationship to let's say engagement? But we have never discussed about marriage or compatibility. I understand if she thinks I'm wasting her time. But this time she really said horrible stuff like I'm using her, that I'm desperate is the only reason I keep her, which is far from the truth. That really hurt me and I didn't contact her for 4 days so far for the first time in 4 years. I'm soooo hurt, I hoped she'd realize, and reach out to apologize. I don't see it coming, and I'm afraid to reach out. Even if she wants to end it, I don't want our relationship to end on a bad note. We're not teenagers, she's late 20s and I'm early 30s. I don't know what to do?

What to do after a bad fight?
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