Ed Sheeran - Bloodstream Lyrics Meaning

He is talking about pain, and drowning himself in alcohol as he states in most of his songs. He says dont leave me lonely, so he might have somebody leave him, either by death or just by walking away. Another thing that Sheeran states is the color crismon in his eyes. We all knpow that crismon is ht ecolor of blood, love and loss. Sheeran could be talking about all three or maybe just one in particular. He then speaks about chemicals in his bloodstream. He probably did drugs, maybe trying to cope with a fact that a loved one that has died. I feel like he is talking about someone he knew. He sings about seeing scars on her. But he obviously isn't a "her" and he probably lost someone to suicide by their own hands, indicating to the "crimson" he saw. The scars could also be emotional scars, talking about something that she went through and never could really heal completely, just like a scar.