My girlfriend and I have an interesting background. I met her at work, we dated in secret for ~6 months. She moved to a different department, I moved companies. We made public our relationship and have been dating for 2 years.

I own a condo, she rents a 1 bedroom apartment. I have a roommate to subsidize my mortgage. She pays a lot to live on her own. She also has a large German Shepard mix dog who I love, however he sheds all. the. time. I invite the dog to stay over occasionally and I always need to vacuum up all his fur, use tape to get it out of my couch (because lint rollers aren't strong enough), and take my comforter to the laundromat to get his fur out of it.

Recently, her stepmom &amp; dad visited us, and her stepmom asked at what point we would move in together. This triggered something in her, because after they left, she told me that normally, couples who've been seeing each other for 2 years move in together, and she's wasting money by paying for a place to live when we could be splitting rent (e.g. mortgage) with her living with me. She also makes comments all the time about how frustrating it is for her to bring all of her items to get ready in the morning back and forth between places when she stays over (but refuses to let me stay at her house bc she can't keep it clean due to her dog...)

In short, I don't want to move in with her. For one, I'm allergic to dogs and do not want to live with one, especially a large, constantly shedding dog who takes up so much space in my tiny 850 sq ft condo. Two, I like having nights alone and not spending every night with her. That's just my personality. I don't want to spend every single night with her. It's not anything to do with her - I love her - but I need my space every now and then. (And I think that part may be what makes me the asshole here but I'd love input). Three, we have no current plans on marriage. She's divorced (she's 33, I'm 27) and doesn't want to remarry. I don't want to get married in general. We're both totally 100% okay with that. Having said that, if we do decide to break up, living together would make it all more difficult. 

Am I the asshole here? Should she expect to move in with me after 2 years? Am I valuing my want for personal space too much over her feelings and living situation? Should I not think that living with her dog is this big of a deal?