I don't think she is pretending. Ak loves Nav in a very different way than she loved Abhi, but that doesn't mean she doesn't love him. Is it influenced by Abhir and wanting to keep the facade, of course, it is. But its a lot more than that.
Ak loved Abhi for who he was, she loved how fiercely he protected her and supported her. When all of that ended during the first leap, she lost a lot of faith but still loved him, so decided to give second chance. With this second leap, all of that is gone now. She loves him but has no faith in that love or in any of it anymore.
With Nav, she realizes that she likes the person she is now more than the person she was with Abhi. A part of it is him bending to her will most of the time. In Kasauli, she is the one who makes all the decisions, and it's all on her terms. So I think she loves Nav because he allows her to be who she wants to be.
Loving someone for who they are is different from loving someone for who you are with them.
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