Feelings that don't go away. Is it fair?

I got out of a two year relationship that included an engagement, we lived together and we had a stillborn earlier this Summer. He was a big part of my life but hurt me in the worst way possible (for me at least). Two days later I ran into an old friend from highschool I had a crush on and now we have been dating for a little over a month. I bring up old memories sometimes out of habit. I know for a fact I'm not over my ex. So is it fair to me or my bf to be in this relationship so soon?
Comments please!

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