It is true. However, imagine that you have lots of different painful memories from many different lives. In addition, your memories seem to be contradictory in some way.I'm not sure this has to be the case. Most people here have painful memories from THIS life, and they are not necessarily with them constantly, and they continue to manage their lives more or less successfully. So on that particular point I don't see any reason why painful past life memories should be any different (i.e. more severe) than painful present life memories.
On the one hand, you have a certain set of views, on the other hand, you have different views (different upbringing, different childhood, different education). You cannot build your identity as a human being.
The longer you stay in one life, the more different situations from the past become relevant to you, your sentiments, an essential part of you.
Meanwhile, you fall into a vortex where there is a buildup of contradictions. All this logically makes you seem to be losing any identity!