Tory Lanez allegedly opened fire on Megan Thee Stallion because he was wasted -- that's what he claimed in a text sent to her shortly after the bloody incident ... as she was still in a hospital bed. TMZ has seen the text Megan got on the evening of July 12 ... roughly 15 hours after she claims Tory shot her in her feet, and in it, he's begging for forgiveness. He wrote, "I know u prolly never gone talk to me again, but I genuinely want u to know I'm sorry from the bottom of my heart."