My new girlfriend having phone sex with her ex rig

So, tonight I was at my girlfriend house who is so sexy and has tons of guys she talks to and just so happened at 3am she gets a phone call and lights up and starts taking to this guy who come to find out is her stud ex boyfriend that just so happens to be the one black dude she has been with and is the same one she told me has the biggest cock she has ever seen or been with and so it's been already 30mins and she is still on the phone and looks super happy and horny. I hear her say ya I'd like that when will you be coming and then heard her say well sooner than later would be better and strangely I sit here and am getting hard as a rock part of me wants to tell her it's ok and I'd support her if she wants to take his big black cock again since I know she can't be too satisfied with our sexual encounters because of her being so fuckin hot I have unfortunately came under a minute every single time and I know she probably got the best sec of her life with this ex boyfriend cause she even brought up his massive cock size and she is still talking with him right now they switched to video chat so she obviously still has feelings for this guy which hurts but turns me on at the same time I don't know what to do I just have to sit her and listen to her get all giddy and excited I am sure if I wasn't here she would be naked already and asking to see his big thick black cock, they started talking about birth control and getting knocked up which got me so fucking hard cause why would they even be talking about that and why is she doing this infront of me does she want to cuckold me or does she simply still want the freedom to fuck whomever she wants ....