All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
The girl and her guardian should choose the husband on the basis of his religion and good moral conduct and they should make Istikhaara prayer before accepting him. They should also seek the advice of those who know and socialize with the person who proposes for marriage.
If it is predestined for you to get married to him even though he does not perform supererogatory prayers, like the Sunnah prayers performed after or before the obligatory prayers and Dhuha prayer and the like, then this does not affect the validity of marriage, and it is not a valid religious reason for a woman to ask for divorce on this basis. Even if the husband abandons performing [some] obligations, and the wife is not harmed by him doing so, either in this world or in the hereafter, it is still not a sound reason for you to ask for divorce.
Finally, it should be noted that the discussion between young females and young males and the exchange of messages between them is a cause of corruption, therefore it is an obligation to refrain from this. If we suppose that there is an acceptable purpose for doing so, the religious requirements must be met, like the knowledge of a Mahram or parents of the content of the message or telephone discussion to avoid any temptation or suspicion.
Allaah knows best.