Girl, you should have took your time and thought of what to say to me
'Cuz I'm not as hard as I make it seem to be
What ever his ex said to him, clearly broke his heart.
It’s possible she may have told him that she doesn’t love him anymore, or that she cheated on him.
Either way, whatever she said hurt a lot. He is vulnerable. He wants her love but doesn’t want to appear too eager. She probably thought he’d man up and move on, but love doesn’t work like that.
OR (other possible spin-off):
Taking the previous line, he may also mean that she should have played with him, teased him, and not tell him that quickly that she is in love with him. If she said the right things, she could have ‘persuaded him’. She became quickly uninteresting.
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