My ex said hope your doing well at the end of message

so basically we broke up almost one month ago and as he wish we decided to stay as friends. I tried to get hold of him and he was not respond much so I was really disappointed I didn't see the point of being friends when we are really not so I wrote him a letter about that I am finally getting over him and how I tried to understand him past 5years of on and off relationship which we were never officially together but always together kinda type of relationship I didn't write anything hurtful I wrote really gentle and nicely I even said I will always be there for him when he needs but I am giving up on him and us. then he replied but the end of the message he said I hope your doing well and I am just wondering if its actually saying good bye don't ever talk to me again kinda meaning ? why would he put that at the end not in the beginning of the message? is that mean have a good life kinda meaning?

My ex said hope your doing well at the end of message
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