Penny for your thoughts

My mind is clouded so I wanted some thoughts on my dilemma... My fiancé sent me a bunch of balloons to work yesterday and whilst I was so embarrassed it was a lovely thought. Anyway I didn't message her after receiving the gift, partly because I wanted her to sweat a bit and also because I was seeing her later and wanted to get her a bunch of flowers as my own gift to her. Anyway few hours later she asked me if I got the balloons and I said I had, but she felt as if I didn't appreciate them because I didn't message her straight away and she was fuming angry with me (which I can understand) I still drove to see her and took her to dinner. She was cold and not very engaging but I tried to explain and make her feel better. Anyway back home I felt as though she was still annoyed with me and rather then upset her further I decided to sleep in the spare bed. also for the fact I didn't want to jump in bed with her and be rejected. Anyway this has added fuel to the fire and now she is even more angry. Apparently she was ok before bedtime and I shouldn't have slept in the spare bed. She tells me she doesn't know if she wants me anymore. we've had arguments like this for a few weeks now. am I just a stupid guy who messes things up? and doesn't understand women