I think Dave's idea about setting boundaries is excellent. I would also suggest that before you do that, you figure out what and why you'd like to tell your boyfriend about how you were hurt by his actions last winter.
Sometimes, I'm not even sure how much he remembers about how he treated me during that time.
What do you want him to remember? If your boyfriend is anything like mine, then he probably DOES remember that he's hurt you, and he might even know what aspects of the relationship still trouble you, but he probably does not remember the words and actions that are still so clear in your head.
I think you should talk to him about what's happened in the past, only when it interferes with how you feel now (not how you felt), and when talking about it serves a purpose beyond just spreading the pain around. There is a certain amount of hurt and anger that you do have to put past you, but if he is even a halfway decent guy, he's got his share too, all the things you worry he'll feel if you confront him, he probably feels already.
I've brought up the past a few times, when I felt that it was best for my boyfriend to understand how my current emotions were being affected by what had happened before. The example that comes to mind is after the death of a relative, when I really took out a lot of anger on my boyfriend and basically didn't give him a chance to be supportive or help me grieve.
Some time before that, when my daughter was just a baby, another relative had died and I had never really felt that I had space or permission to mourn her. My boyfriend was pretty impatient with my sadness, didn't want to talk about it with me, refused to take on any more of the baby care.
My reactions to him after the second death in the family were really more about what had happened the first time. I felt that I owed him some apology and explanation for why I wasn't really letting him be a partner to me, now that he was willing. Basically I said to him just what I've said here, and asked him to step back and let me grieve it-- all of it-- on my own. I think that conversation did both of us good.
Hope that helps,