Break up because he was too comfortable?

Anonymous
My boyfriend of 2 years broke things off about a month ago (hes 27 and I'm 26) and he said that he thought the relationship was too comfortable. He said he had this unexplainable deep feeling, that made him feel I might not be "the one" He said I've been the perfect girlfriend and he just can't explain it, but he thinks we should see other people because we probably won't be able to make each other happy in the future. He couldn't name one negative thing about the relationship. He said I'm his best friend and that all the time we spent was sincere and that he cares for me.

This all happened after at least 3 weeks of him constantly seriously bringing up marriage, kids, buying a house and telling me how wonderful I am. I happily agreed with all of these suggestions. He was even acting overly excited talking about a big surprise he had for me. I thought I would be getting a ring as my surprise. When I was away one of the weeks he constantly was checking in, saying how much he missed me. I never pressured for marriage, he brought the idea up on his own and I excitedly agreed. He seemed absolutely in love with me, more than ever before and seemed as excited as when we first started dated. Our sex life continued to be great, both of our jobs and other areas of our life were going great. I have no idea what happened.

So its now been a month since the breakup and a week of no contact (we had been talking only to exchange stuff/ and once for me to ask if he really had a reason, not just an "unexplainable feeling." The last email I received from him was him apologizing for how awful he has made me feel. He said that he hopes that I find happiness again. (no trying to get back together again)

I'm moving on, and not planning on him giving me an explanation or anything but does anyone have any insight on what may have happened or what this unexplainable feeling is about.
Break up because he was too comfortable?
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