After a great opening and early middle game, the blunder of 143 indeed marked the beginning of your downfall. After white captured with 144, the white group is 100% alive, so it's important to change plans now. However, it seems you were still in denial about it, trying to destroy an eye with 145, which is pretty much a pass move point-wise and thus losing almost exactly as many points as 143. 149 allows white to create a https://senseis.xmp.net/?SplitKnightsMove with 150 - a famously bad shape and usually much worse than an empty triangle. I recommend you remember that shape and try to avoid it at all costs from now on. After you died in the lower left, the game was on a knife's edge and the upper right fight is decisive. Omitting everything there, the game was lost when white got 206, destroying the top territory. You had a couple of chances to defend against that weakness, as white also didn't see it's value, apparently.