I'm so sorry this happened to you. I understand how painful it is, and the feeling of being too tired to even try find another relationship. I've been there.
I am 52 and still hope that one day I'll find the person I truly connect with (if I don't ctb first) but like restforeternity said, it's hard to find these days. Everything, including relationships, seems to have become so disposable and replaceable (not everyone thinks this way but it seems a lot of people do). But please know you aren't too old to find another love, to have an entirely new life awaiting you out there...even though that idea probably seems ludicrous to you at this moment.
There is a singer/songwriter named Daniel Johnston. He suffered from many mental illnesses and was not the most talented singer but his lyrics are relatable and he is raw and real and because of his struggles, his music reflects that and while many don't appreciate him I do and especially this song (in case anyone is interested, there is a documentary about him called "The Devil and Daniel Johnston", which was how I stumbled upon discovering him). Maybe this little song will bring you some comfort. I truly do understand how painful and awful it is to have a long term relationship end and to feel like you are right now. Sending you a hug.