<human>: Can you summarize the given text in a few sentences?

Do you know how some people you naturally click with and immediately become great friends with? This person was one of them. We naturally clicked and over time we became close friends. During our friendship, we were like salt and pepper... everything was much better when we were together and there was genuine affection between us.
Eventually, I realised I was crushing and made a move. For a while it was amazing BUT it was a short while before everything came crashing down and it came to an end.
There was a break and then an effort to become friends again but for many reasons, I think this friendship won't work anymore. I can also sense that we aren't the same friends as we used to be. There is an air of bitterness, toxicity and the laughter is gone from what used to be a beautiful friendship. I have made efforts to restart the friendship and bring back the positive elements that were enriching but the joy is gone.
I have decided to write one final message as a final try. I still love them and I have made that clear. If I were to be friends again, I am not going to hide this fact but I think it does bother them. So I am thinking of how to write this final message. I'd like to be hopeful but I know if the relationship remains toxic, I am better off without them and in my brain I know this but my heart cannot admit it. I would then like to write a little farewell to thank them for all the positivity they brought into my life in the past, the great times I've had with them and all the best for the future!
Any suggestions on how I should write this last message and then a farewell?
<bot>: Can't stay friends anymore with someone who was one of my closest friends because I am still in love with them. I want to write a last message and then bid farewell. Any suggestions?