If I hid from my boyfriend that I got attacked, is it considered lying by omission?

I am hiding from my boyfriend that I was attacked and raped. I am already going through so much I don’t want to bring it up I am scared of his reaction and I am just not feeling like I want to experience more trauma. I just feel like maybe he’d be angry if he found out somehow and I don’t want to look like a liar and have him leave me.
If I hid from my boyfriend that I got attacked, is it considered lying by omission?
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