How can one return to commitment after a relapse, especially when drifting away from friends who are considered the cause of this deviation?

Among the dangers of mixed-gender education is the establishment of illicit relationships. It is your duty to sever your ties with this girl immediately and to abandon sins out of piety towards Allah. And beware of the dire consequences of sin, for its pleasure cannot be compared to Hellfire.

What will help you remain steadfast is to ask Allah to expand your chest, and to associate with righteous company.