She regularly complains about how I don't express my feelings. However, after I said about how I was feeling depressed and lonely, she went off about how I make everything about me and that I ask her to act as my therapist.
Your best strategy is probably NOT to try to understand the contradicting messages that she gives you, but to find ways to
mitigate them. Honestly, she probably means that sometimes she wants to hear about your feelings, and sometimes she doesn't. It might even be that she only wants to hear about the
positive feelings as they relate to her, but not the negative ones (and certainly
not as they relate to her!). And yes, that's selfish and disordered. Can you live with that?
It's funny, because my uBPD ex was the same way - she wanted me to essentially be her therapist, but that was not a two-way street
whatsoever.