Is he getting excited to go masterbate over it, or is he just excited? Have you expressed your hurt to him over him being excited about online content vs you?
That woman keeps coming up on my instagram aswell I don’t know why everyone’s getting hyped up over some random lady doing what prostitutes do on a regular basis sleeping with many many men. Ask him if he’d be okay if you slept with that many Different guys if he’s getting all excited about that
Ask him to be honest, if he has any hidden desires that you both could try out. Ask him if he is looking at porn which may also be lowering his desire. Perhaps, he feels guilty for not satisfying you, or thinks it's too hard to satisfy you and so doesn't try... as he knows he will feel deflated after. If not, then see if he can go to doctors or sex therapy to get his libido up, see if anything is unbalanced with his hormones etc.
Is he happy in his life? I know this sounds mad, but my sex drive was so low and then after I had my baby, it went up. The only change, other than having a baby, is that I'm extremely happy with how my life is now. Like I feel completely different as a person & my sex drive changed when I was happier. I also find that spending 1 to 1 time with my partner and feeling emotionally connected to him has helped me loads too. We don't go out on dates much, our LG is 5 months old so childcare can be hard, but we watch a show together & make food together etc. Also, if alcohol is involved it's always worse for me. My partner doesn't drink, but if I have even one drink, sex just isn't giving at all. I'm not sure what to say about him sounding excited about the Lily Phillips thing unfortunately and I wouldn't like to hazard a guess on that one either.