OP, I had a similar experience as you. My ex got pregnant because of me, I didn't understand then but she changed almost like your ex did. At first my ex would tell me how she wants me over then suddenly she starts telling me to don't touch her and how she doesnt get enough sleep at night because I'm around (I tried to hug her in bed). This continued for a few nights...
Anyways, what was the reason your ex wanted that expensive umbrella?
Well, all I can say is try to restart the relationship somehow.