<human>: Give me the gist of the text in a nutshell

Hello reddit. 

This is a throwaway account. Recently one of the closest people in my life had passed away. Besides the sentimental things in this world my significant other has left a huge conversation on facebook that spans throughout our entire relationship (actually even a bit before we started dating). It is extremely important to me because it shows the dynamics of our relationships and how we changed our tone of talking to each other and our fights and also warm vulnerable moments, "thanks yous" and "fuck yous" and everything in between. 

**What I need help with**: I need a way to make these 200k+ messages between us readable in one way or another.

**Why?** Live words uttered using keyboard, many things I have forgotten, but they are still there. This will allow me to see what I have not paid attention to, discover something new about myself and my significant other and allow me to just go back in time and indulge myself in some reminisce on thing in our relationship. Inb4: move on - I will...I am trying...but that doesn't mean I can't go back into the past once in a while.

**What I've tried**: I've tried multiple javascripts, and codes that would interact with facebook directly, but most of them fail in the end because the conversation length is very long. My browser would stall and crash, even though I have a very powerful computer. 

**What I have right now**: I was able to download facebook archive of my account and it contains a .htm file with all the messages, the problem is they are all like soup. I was able to find some python scripts that are supposedly meant to deconstruct these files but I was not able to do so myself. I am so committed to this that I even tried to learn python and write my own script but that failed. I found some scripts like beautifulsoup4-4.1.0 but I cant make them work. I made multiple google searhes but in the end most sollutions are either dated or not applicable to a conversation length this big.
<bot>: Please help me find a way to deconstruct a conversation between two people on facebook from messages.htm file so it is presented in a redable format. I will be eternally grateful to you.