I like my friends gf

I can’t stop fantasizing about my friends gf. I fantasize about him offering her to me, I fantasize about us sharing her, pretty much any dirty thought I’ve fantasized about her. Every time I jerk off it’s to a picture of her. And you want to know the weird part, I think my friend may have the same thoughts. We message each other all the time telling each other what we’re doing in our lives, even telling each other when we’re about to jerk off. Whenever I’m about to jerk off I tell him I’m about to stroke and I need something to stroke it to, he usually suggests some porn videos but sometimes he sends me a picture of his gf, nothing sexual or erotic, just a simple selfie of her. He would later delete the picture maybe out of shame or guilt. I just had to get this off my chest, let me know what you all think.