The first one is a multichaptered story where Tony has different horrible relationships every chapter. I remember he was dating quite a rude vulgar guy (who was openly talking about their sexual activities) in chapter 1, then there was a chapter of an ex talking about Tony in TV, then another where his girlfriend left bruises all over him etc. It ends with Tony going to rehab and starting a relationship with Steve. In one of the last chapters Steve and Tony go to therapy together.
The second story I think was deleted. It was by romanoff on ao3, domsub au, Tony ends up with a terrible Dom after he breaks up with Steve. Romanoff is rewriting it now, but there used to be a shorter one chapterd version that also got an end.