Артур
Нейтив написал бы примерно так, звучит более по-английски:
Seeking friendship only. All messages offering relationship or flirting will be ignored.
i am looking for friends only . I am not interested in flirtations and romances, so do not offer me that .
Напиши проще - "Я фригидная ""
I`m looking for friends only. So don`t flirt with me and don`t try to start a romance with me.
I'm looking for friends. Please, don't offer me flirt or romance (/ love affair).
I m searching only friends, please dont offer me a flirt