Should I tell my former fuckbuddy's girlfriend/ex (?) that he cheated on her with me? should I call him and talk to him about her?

nocturnalbaby
okay so my fuckbuddy hasn't contacted me in almost 2 months, so I've suspected that he must have a girlfriend or is seeing other girls, or both - whatever it is, something is distracting him enough to not remember or think about me. I live alone & not too far away from him, I'm quite convenient for him to visit, and he STILL hasn't talked to me, so yeah something's going on.

I've known him for the last 2 years, & I found his Facebook account & came across a girl who was commenting on his photos in a way that made it clear they're in a relationship. however, those comments were from 2 years before I met him, so I wasn't sure whether they're still dating or not. He has been telling me this whole time that he's single, not looking for a relationship & hasn't been in one for a long time. He would tell me he loves me & wants to date me once I move back to my hometown (cause I was living away in a different city for university & didn't see him often), but now I'm back here, and he told me that he's not looking for a relationship right now because he's stressed with work & is waiting to open his new businesses and all that before he focuses on a relationship. He said 'if it happens it happens, but I'm just not actively looking to get serious right now.'

At this point I'm sick of waiting for him, so I've decided I might as well just end it for good with him which will most likely happen if I mention that girls name (if they're still together). Should I surprise him by mentioning that girls name to make him aware that I'm aware of her & see how he reacts to find out if they still might be dating? should I message that girl myself and ask if she's still dating him & let him know he's been with me & telling me he's single? I just wanna make her aware cause I think it's unfair that if he's still her boyfriend, he's just getting away with this & she thinks he's an amazing guy when he's far from it. or should I just leave it & let her find out for herself later in the future?
Should I tell my former fuckbuddy's girlfriend/ex (?) that he cheated on her with me? should I call him and talk to him about her?
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