Can you be selfish with someone you love?

I think you should but I wasn't able to that's why I think my last relationship didn't work.
I wasn't able to open up to her and tell her I needed more of her time, nothing much 5 mins a day at least.
I gave her space cause she was coming out of a break up, but I think I gave her too much space and she might have thought I wasn't interested or there for her. Which led to our break up.
What do you think? Should I have been more selfish?
And should you?

Yes. And why?
No. And why?
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Can you be selfish with someone you love?
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