What are some signs of a submissive girlfriend?

I'm not talking about sex, I'm talking about personality.
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The reason I'm asking is because recently I found out that my fiance was cheating on me (and he left me for the other woman). I really loved him, and looking back I feel like maybe I was dating someone with NPD. When I made friends with one of his exes, she told me he has a history of dating "submissive" women. Turns out the woman he cheated on me w already left him because he was telling her how to wear shorter dresses, heels, makeup, and not texting her unless she texted first.
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So was I submissive? Or was he manipulative?

Normally I'm on the heartbreaker side of things, and this time I fell hard, so I'm kinda confused. Also, I feel like my personality changed a lot for him, and it was like I didn't even know it. I even offered to pay $500 for a flight for him, something that I now look back on and find ridiculous. Reminds me of the "foot in the door" phenomenon in psychology in a way.
What are some signs of a submissive girlfriend?
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