Just looking at the picture this already seems like amateur work.
As for the music being … Yes it’s pretty flat and unexciting. Realistically lots of today’s music is already a remix of a remix and honestly… quite generic. Bands have been cast for looks for a long time, autotune has been here for ages, and with a better effort in the voice department I don’t see AI artists being far off. I don’t think they will ever completely replace artists here, especially since live events really are a thing of their own but… eh
Most likely cut your losses here. At the very least a month of not seeing her and then re-evaluate.
There is no trust and while I can’t say it’s unwarranted… What does earning trust mean? Assuming you want this to work when has she done enough?
IF your want to take the risk and take her back … This can’t hang over your relationship. You have to let it go and never speak of it again.
By all means tell her it hurt you and that is a one time offer and you expect strict monogamy and honesty from now on before you forgive her. But when you DO to forgive her it has to be gone. Otherwise it will grow and fester and you will always be hesitant and she will always feel untrusted.
If you are not prepared to do that let her go and set everyone involved free.