Having been forced to defend myself on another thread I have admitted that DP and myself have now parted ways. We were together for a lot of years and i have watched his DC grow up. There have been so many issues but for the most part, my issues surrounding being a SP to DSC had been fairly resolved. I always got on well with them but being a SP is very hard. You are expected to parent without being a parent. To step back from situations that affect you directly. To have an opinion on things but accept that you have little say. Our breakup has nothing to do with the children but certainly in some way, deep issues that DP has as a result of how he was treated by his ex. I thought these had resolved but it would appear not.
It's a hard job but it's very rewarding too. I have the greatest respect for SP and the very important role they play in bringing up their SC despite what many people on here say. I will miss the DC so much but I'd recommend anyone having issues with their SC to think how you would feel if you never saw them again? It's very hard, so try and embrace the good times with them, drink wine through the hard times 
and hope that it will all work out in the end. I'll continue to post advice, as I have always done, if there are threads that I feel I have experience with because what we did with the SC and indeed a very rocky relationship with his ex seemed to work in the end. Good luck to all you SP, you're doing a fab job 