seni özlüyorum cnm ben ama istadayken üzüdün bei gerçekten ama senden kplmak istemiyorum ben cnm

It may be like this.

Caným, seni özlüyorum, ama Ýstanbuldayken beni gerçekten üzdün. Senden kopmak istemiyorum.

If the written owner is a Turk, he/she is really idiot person. Becouse those words are not from Turkish languages, they are just from idiot´s language.

Maybe wanted to say,

I miss you but you made me unhapy when we were in Ýstanbul. I don´t want to leave you.

( I can´t speak English well, sorry, I hope you will understant what I wrote.)

Don´t you think ´kplmak´ could be ´kapýlmak´ - so ´I don´t want to trust you´?  The verb should take ´a´ not ´den´ but you say the Turkish is bad.

it could be but then it would be "sana kapýlmak istemiyorum" but it is "senden kopmak istemiyorum"