In 500 Days of Summer, what did Summer mean when she said that…?

I’ve never really gotten what she means at the end just before she holds his hand tightly on the bench. She said she was never sure of what she wanted when she was with him….or something along those lines.
After she holds his hand she looks away and fights back tears. I took it as she was never sure if she could love him while she was with him, but now that She’s married she realized she always loved him. And his character realizes it too as she looks away. Am I wrong? What did the scene mean in thier last moments? He finally accepted that he had to let her go?

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