Jennifer..

...I just left a 5 year relationship and previously I left a 22 year relationship so I have experience in this area.
If you have gotten to the point of exhaustion from trying in this relationship and you ARE to that point because you are typing out your feelings in this forum...Than you have to tell yourself you ARE STRONG ENOUGH...to do what is right for YOU.
Is it the living situation that is difficult to get out of? That was my biggest hurdle..i owned the house and felt bad "kicking" him out...But, I had to do it...He had no where to go but it finally got to the point where my moods and sleep were impacted SO much that I was becoming extremely unstable and unhealthy.
Do you have somewhere to go? You have to make a plan and do it.
And you said you are afraid some other girl will get what you have been waiting for. Well, I doubt that will happen if it hasn't happened with you in 6 years he is not going to "change" overnight.
Its very possible you take the step to end it and THEN he changes and there is also a possibility of you two getting back together if those changes occur.
And if it is not meant to be all together..you need to free up yourself so that mr right can come along..you will not find him in this relationship as you have already decided at this time he is NOT Mr. Right.
__________________
"I'm not crazy, I'm just a little unwell"
(My girlfriend had this ringtone for my phone calls...lol)
Bipolar 1
Anxiety
Current Medications:
Lorazepam
Zoloft
Abilify
Gabapentin