Help! Boyfriend constantly Jerking

Your thoughts please. So my boyfriend and I have been together for 5 1/2 yrs and have been living together for the last 5 months. Lately, he's been busy with work and we haven't been having sex as often as I would like. However, I have noticed him masturbating to porn daily! I already knew he enjoys masturbating, as do I sometimes 😊, but I would rather have sex with him if I have the option. He, however, will go masturbate in the bathroom even if I'm home and in our room. Every time I try to talk about it, he just tries to deny that he even does it. He says that he feels uncomfortable. Which I somewhat get,  but I feel like our relationship is well past that. I have tried to just let it go but I can't. I feel ugly and not good enough when I know I'm damn well am... but I can't help it... I just feel so terrible about myself when I hear him masturbating to porn. I have already told him how I feel and he just doesn't even give me a real response. And I highly doubt he's cheating, he's a terrible liar and I'm sure I would have figured it out by now.