Letting go of the past hasn't really been a problem for me because I am not a very sentimental person. Stuff happens (for better or worse), I learn what I can from those events, then try my best to move on. This is not to say that I discard my past completely. Far from it. I just don't dwell on things so long that they take over. Life is too short, and there's so much more out there to learn and experience without the past holding me back.
As a side-benefit, things like "recovering from heartbreak" and "moving past mistakes" a bit easier.
And yet... there's always something there to remind me...
This was made perfectly clear over the past few weeks while I've been cleaning out a storage unit I've been renting for the past 18 years... and haven't opened in 16 years.
A lot of stuff I had thought was dead and buried has suddenly come back to haunt me, figuratively speaking.
Which means I was sentimental at one time to have kept all this crap... but ended up losing my sentimentality sometime in the mid-90's.
95% of my stuff in storage is going straight to the dumpster.
Where it probably belongs.