When a guy says he's a sucker for you?

So me & my guy friend were seeing each other for over a year. It recently ended last week & it's still hard between us trying to move on, we both gave up the temptation of being a part & started talking again. Last night he said I think we should stop talking again as I'm a sucker for you and this isn't helping either of us.

What does he mean by he's a sucker for me?
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+1 y
I should add he never loved me & he was the one who wanted to break things off due to arguments.
When a guy says he's a sucker for you?
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