Feeling helpless

I've been dating a wonderful woman for about 3 months now and although I haven't said it I have fallen in love with her. There's great chemistry, both emotionally and physically, and I think the world of this special woman. Ive had a history of ignoring red flags early in relationships and as a result I've been married twice. I've been having counselling for this and it's making a huge difference in my life and I'm determined to not repeat the mistakes of the past. There have been a few occasions where the woman I'm dating has been quick to get angry over seemingly very small things. She becomes snappy and she's difficult to talk to. This has caused me to be a little cautious and at times I find myself tip toeing a bit as I don't want to upset her. I know I shouldn't have to be that way so I guess it's raising some red flags. After an incident of this the other night, we tried to communicate about this. I explained how I was feeling and she basically told me that we mustn't be suited to one another like we thought. I told her I just wanted us to talk, understand each other, and grow closer. She broke it off saying I was too sensitive. I'm heart broken. I know we have something very special and it doesn't make sense to break it off over this. I've written and posted a heartfelt letter to her asking for her to consider giving things another chance. So far I have heard nothing (2 days) and I'm worried I've lost her. I'd really appreciate any advice on this situation and how to act in trying to get her to reconsider. Thanks so much.

wait for her reply or call up to ask