My boyfriend hit the RESET button. Help?

My boyfriend and I have been dating for about 8 months. We are pretty serious. However, we both have traumatic pasts. As a result, we both suppress our feelings a lot.

I, personally, find it difficult to express my feelings, especially negative feelings. for example, if I think you are being rude to me, it is extremely difficult for me to say it to you.

I had certain preconceived notions about my boyfriend. In a recent fight, I told them to him. He got pissed. I think he got hurt because he never thought I would think about him that way. I obviously didn't mean to hurt him that way. The weird thing is that the fight happened because I was telling him how I felt hurt because of something he said.

Anyway, he and I have kind of sorted the fight (if not entirely). He said that in his head, he has hit a reset button. So, of the 8 months we have been together, he is not going to count the last 5 months. 

Now, in his head, we have been together only for 3 months. He said he wants to go back in time to resume our relationship at a stage when I hadn't yet formed those thoughts about him. He also said that if we do have to part, it will be easier if he thought we were together for 3 months instead of 8.

Now, I feel weird because that's like him telling me that the last 5 months didn't mean anything. Somewhere I also know that he said that out of fear of getting hurt.

If you have read my problem, please tell me what you think. I would really appreciate it.

Thank you.