"I hope that he/she loves you as much as you love him/her."
Here's a breakdown:
* Espero: I hope
* que: that
* el/la: he/she
* igual: the same
* te ame: loves you
* como: as
* tu: you
* lo/la amas: love him/her
The phrase expresses a wish for the person being addressed to receive the same level of love from the person they love.