Sexual frustration

Hey everyone. I am 47 and my long term GF is 46. We’ve known each other since Junior High School… started dating in 2019 after both of us being in long term relationships. We reconnected on a Fetish website. Both had very strong sexual appetites. As of late, hers has fizzled to almost nothing… she can’t explain it…. Says she loves me more than anything and still finds me very physically attractive…. Yet she has no interest in sex or anything relating to it. I shouldn’t say “No” interest…. But it’s very minimal. I however still have the libido and desire of an 18yr old boy. She sends me nudes all the time still… she thought maybe early menopause or depression…. I have come to her with my “complaints”…. I’ve tried every angle to broach the subject. She just gets angry or seems very nonchalant about the whole thing. I haven’t had a blowjob in months…. Like 6 months or longer and sex if I’m lucky once a month. She never or rarely initiates it either… it’s left me feeling very unwanted…. Undesired…. I have actually thought about cheating…. Not because i want to be with anyone else in a relationship… I love her more than anything but I’m losing my mind. I know there are no real answers here and this was more to vent. But it’s starting to have a negative impact on me mentally and emotionally.