I am on the "girlfriend" side lol. I think is unfair. You had your opportunity and you didn't take it. Let him be happy with this other girl. If the relationship doesn't work and you guys still find each other, then go for it.
Jason is just an illusion of "what if", if you weren't ready after 6 years of talking to him what makes you ready now? The fact that he has another girl??
Please don't become that girl that chases the guy in a committed relationship, don't mess with his feelings either because you just know that you are not ready.
Good luck
