My girlfriend (26F) and I (27M) have been together for about 2 years now, and we have had an amazing relationship. I think we compliment each other really well and she makes me feel very happy. I decided about a month ago that I wanted to propose, so I went ahead and bought a ring. I have been planning a special proposal so I want it to be a surprise. As the date of the ring's delivery has gotten closer, I have been increasingly more guarded. I haven't been letting her use my phone like usual for fear that she might run into some of my etsy conversations with the vendor or see receipts in my emails. In the last few days I had been going out to check the mail many times over because I was anxious that the package had arrived and she might see it before I did. She has made a couple of off-handed comments and I noticed her getting suspicious of my behavior but I played it off pretty well.
Finally, the ring was delivered today and I managed to sneak it in the house without her noticing and kept it in my office. Tonight, I waited until I thought she had fallen asleep and snuck into my office, and closed the door to examine the ring, hide it, and dispose of the packaging.
Just as I had finished with everything, she barged into the office and asked what I was doing. I lied and told her I was watching some videos and didn't want to disturb her while she was sleeping. She read right through me and became very upset, as she knew I was hiding something from her. She stormed off to bed and shoved off my attempts at affection.
Finally I told her, babe I need you to listen closely:
I was not doing anything bad or wrong. I was doing something good, very good, and you would approve of it.
There are cases, believe it or not, where it is right for a couple to hide things from each other. This is one of those cases. I am willing to speak to a third party, tell them what I was doing, and they will tell you I am justified.
She became more frustrated and went to stay in the living room. I tried to reason with her to come back to bed, and she said she was busy doing "her things" and she didn't have to explain to me why or what she was doing… Now I am lying in bed alone with a pit in my stomach, writing to you all, unsure of how to approach the situation. How should I smooth things over?
TL;DR
I have been acting sneaky around my girlfriend hiding her engagement ring and she is upset with me for it.