“When a friend changes on you and you dont understand why , should you let go or try to get the friendship back even though you have tried countless times”

And when you put it like that, it seems you’ve answered your own question. It’s sad to lose friends, but as you grow older and circumstances change, this is what happens. Just work on letting it go, seems that’s all that’s left to do there.

My sympathies and best wishes. And congratulations on finding a man to love. 🙂