Alhamdlilah brother for having concern over your sins and showing remorse over what you have done.

Sadly,  due to the constant exposure of our youth to sexually explicit material they are filled with desires without any Halal (lawful) means of fulfilling them resulting in committing fornication or masturbation.

Dear brother, you must try to break all relations with non mahrams as this will take you away from ALLAH Ta-aala and closer to Shaytaan.

The Prophet sallallahu alaihi wasallam said:

Texting and messaging also comes under this as a person is considered alone with the person they are communicating with. Shaytan takes advantage of this and fills their hearts with evil thoughts and from there it escalates until it leads to zina (fornication) and deteriorates the moral character of a person.

Also it most be understood that breaking your fast without any genuine excuse is a grave sin.

Imam Al-Kasaani states:

You should make sincere tawba (repentence) to ALLAH Ta-aala of what you have done.

As for your fast then it will be broken however you will only be required to make up a fast for that day again after Ramadan and not required to keep 60 fasts (kaffaarah).