Coldsore looking wound on my gum above my crown. Slightly hurts when I bite down on that tooth. Help

The wound has been present for around a week or two and majority of the pus is out. Wound is getting better but is still there. When i bite down on that tooth, there is a slight pain and the crown moves (slightly) when i wiggle it around. I dont know whether the wound is making my tooth ache or if my root canal and crown are decaying or infected. The pain is not always present when clenching my jaw but it does hurt when i eat or just randomly.