Allah, the Forgiving, the Merciful never abandons anyone. Even if you have sinned gravely, if you repent sincerely, Allah will forgive you.
“Say, “O My servants who have transgressed against themselves [by sinning], do not despair of the mercy of Allah . Indeed, Allah forgives all sins. Indeed, it is He who is the Forgiving, the Merciful.” Quran(Surah Zumar, 53)