Common Acacia Blue (Male)

It's said to be found island-wide in the guide I use. There's another possibility too, Purple Leaf Blue (Amblypodia anita). The main difference between these two is Acacia blue has only one tail and Purple leaf blue has two on the hindwing. However, that part is missing in this one. The best match for this one's upperside view was Acacia blue, so that's why I suggested that.

Oh... Maybe it was attacked by a spider. Even if it survived the attack, the poison might've been deadly for the butterfly.

Where did you find him?

Oh, the poor thing... Maybe it was too damaged from the injury it received from some predator... Or maybe its days are over