Dating someone with a partner? Here's what to do.

Dating someone with a partner? Here's what to do. YOU HAVE EVERY RIGHT TO GO OUT AND TRY TO MEET NEW PEOPLE ALSO MY QUESTION IS I'M SEEING A GIRL THAT HAS A BOYFRIEND I DON'T WANT TO PLAY SECOND ANYMORE WHAT DO I DO A PIECE OF SHIT FOR EVEN ANYMORE NOT HAVING RESPECT OKAY YOU GUYS HAVE NEVER BEEN TRICKED BECAUSE I'M ACTUALLY GONNA I'M GONNA TALK OFF PERSONAL EXPERIENCE A FEW YEARS AGO I MET A GUY IN LA HE WAS PURSUING ME SEEMED SUPER GREAT WAS SINGLE THAT HE HAD A GIRLFRIEND UNTIL MAYBE LIKE 4 OR 5 MONTHS OF US SEEING EACH OTHER SO AT THAT POINT AND ALSO STILL I WOULD SEND PICTURES BE LIKE IS THIS YOUR GIRLFRIEND HE'D BE LIKE NO YEAH DENYING IT DENYING IT SO I DIDN'T THE TIME THAT I ALREADY SO INVESTED IN HIM AND BEING YOUNG EVEN NOW I HAVE SUCH TROUBLE WALKING AWAY FROM PEOPLE OR LEAVING RELATIONSHIPS SO IT WAS HARD LIKE OH YOU HAVE A GIRLFRIEND I'M JUST GONNA GO COLD TURKEY WE'RE NOT GONNA TALK OR SEE WE'VE BEEN TEXTING EACH OTHER EVERY DAY FOR 4 OR 5 MONTHS SEEING EACH OTHER THIS GUY HAD A GIRLFRIEND OF 7 YEARS BEAUTIFUL GIRL IF YOU'RE SEEING SOMEONE WHO HAS A PARTNER YOU GUYS HAVE DISCUSSED BEFORE WHETHER YOU GUYS WANT TO BE TOGETHER OR NOT YOU HAVE BECAUSE YOU'RE SAYING I'M SICK OF PLAYING SECOND FIDDLE YOU NEED TO SIT THEM DOWN AND HAVE A SERIOUS CONVERSATION WITH THEM THAT YOU'RE NOT GETTING WHAT YOU NEED OUT OF THE RELATIONSHIP AND YOU FEEL THAT IT'S MORALLY WRONG FOR THEM TO BE GETTING THEIR CAKE AND EATING IT TOO HAVING 2 PARTNERS LEADING BOTH OF YOU ON AND IF THEY'RE NOT WILLING TO DO THAT FOR YOU THEN MOVE ON THERE'S SO MANY PEOPLE IN THE WORLD WHO ARE SINGLE AND READY TO LOVE YOU IN THE RELATIONSHIP THAT YOU WANNA BE IN