How can I help my friend?

[kyle]

My friend with autism was talking to a girl on plenty fish and they got along fine at first, like she would message him or that, but then he asked if they could meet and if she would call him or that, and she said maybe. But then she never calls him or shows up, he then keeps talking to her and she ignores his posts, she then blocks him and then unblocks him, he then keeps obsessing over meeting her but when she confirms she never ends up meeting him like in a few messages. He also is obsessing over her now and thinks she loves him when the opposite is true, and he keeps thinking if I found her maybe then she would love me, should I try to help my friend snap out of this and realize the truth or let him live in his fantasies, the worst part is I caught him masturbating over her and he would jack off over pictures of her. And he's considering committing suicide now because she won't meet him or doesn't feel the same way she feels about him.