Breaking up is hard to do. Just ask Kate Hudson, who has been leaving phone messages for her ex, Alex Rodriguez, frequently since they split earlier this month. An insider tells BettyConfidential that the Nine star has been reaching out to A-Rod but the Yankee third baseman isn’t taking her calls.

While Kate has mocked the tabloids’ characterization of her as someone who gets too serious with guys too quickly — she told Harper’s Bazaar earlier this month, “I’m not needy” — the insider says her behavior tells a different story.

“Kate realizes now that she drove Alex away by being so pushy about marriage,’’ the source says. “She’s left him messages, but he hasn’t returned her calls. She wants to talk to him about how they can work it out without having to tie the knot.”

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But Alex is telling friends that he’s moved on. According to the insider, A-Rod’s told pals that he’s not angry with Kate — he still has feelings for her — but he doesn’t believe that she would settle for anything less than marriage. “He thinks that after a month or two, she’ll start needling him about setting the date and he’s not ready to get married again,” the source says. “He may never be ready. Right now, he doesn’t see a wedding happening in the near future. He stayed with his ex-wife [Cynthia] longer than he should have to try and work things out, but it didn’t help. It wasn’t the answer.”

‘’Now Alex is enjoying his freedom and is having fun being in the company of new people. He’s not looking to get seriously involved with anyone and if he does, it won’t be a famous woman,” the insider says. “After being involved with Madonna and Kate, Alex doesn’t want to share the limelight.’’