<human>: Can you give me the gist of the text in a nutshell?

My ex is my best friend still and we still live together.   I still know the love is there as I am reminded of it all the time through words and actions.  He does see other people and is serious about them, but they always end.  I get strung along during the times where hes single and even still have sex while he's not.  Everytime I ask about getting back together I'm given an answer about ruining our friendship.   
We have 2 dogs that we have raised since birth. One is 9 and one is 2.  We don't wish to remove them from the only home they ever knew or remove a master from them.
I love him more now than when we were together and can't even date anyone else cause it feels like I'm being unfaithful.  I am friendly with the new lovers and treat them as i would any other guest.  
Above all we are friend and will always be and I deeply cherish that bond, but the pain I feel everytime he begins a new relationship is becoming unbearable.  How do I break this cycle or at least end the heartache?
We are both men and he is dating members of both sexes.  
My house that I own by the way.
<bot>: Still living with and best friends with ex that acts like we are getting back together in between new relationships leading to my heartache .