3 years a long time..if u let it go now because of uncertainty, how sure are you it wont happen the same with your colleague? like u say, love is sweet in the first place, and it will tone down.

she is as confuse as you. frustrated, lack of confident, and probably saying words like "let's break up" against her heart..just wanna see your response.

i think both you and her been through few times break up until both also quite tired... i guess now you are more feeling independant because u have a colleague for you to fall next. but if it doesnt work out, chances are you might regret this decision in future.

personal opinion, talk back to your gf. open your heart again with her. probably can even show her this thread. tell her u r insecure too and frustrated. come to a compromisation. go for a week vacation together. tell each other what's yes and what's taboo word not to bring up anymore.

then only decide if it's "unpatchable" and at least both of you give it one last chance, but not the kiddish breakup phrase.

i've been through similar phase, so i know how it felt. so hope tis can clear your head abit. if you already have some answer in your head what to do next, then all the best.