Only if you truly do.
Should I love her as much as she loves me?
If you don't love the person, be generous & stop wasting the both of your time being together. The more time you two are spending together she could be with someone who could love her so much more & give her his all. Both partner should love each other with no doubts or questions.
This should answer it for you. Think about it.
How unfair would it be for you NOT to? The question is CAN you? And if you can't, let her find someone who can.
Yes you should if she loves more than you