Me and my ex are seeing each other again but?

He never tells me he loves me.
He’s the one who left me and treated me badly.
So I’m tryna be in the good books and not cause any disagreements so we can try and be together again when he’s ready.

But sometimes I let it slip that I love him but I say it by accident and then I tell him I’m sorry and I feel like such an embarrassment as he never says it or talks about relationship things with me.

I just want to know how do I change myself to become like him where I don’t feel?
Me and my ex are seeing each other again but?
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