Going to be kind of long: I met my fiancé about 6 years ago after I left my sons father (I was with…

Going to be kind of long: I met my fiancé about 6 years ago after I left my sons father (I was with him for 8 years of abuse, cheating, lieing, stealing from me). My fiance and I were just great friends, we hit it off right away but he was 6 years younger than me, so I had no intentions on dating him. We kept in touch for a few years, talked about our dating experiences, breakups, life in general, we got along great! Well he ended up going through a hard breakup in which he met this rebound girl and dated her for about a month, he broke it off and about a month later she was pregnant with his child. He again called me for advice (we were still great friends that told eachother everything!) I actually told him to try and work things out with her to see if it went anywhere for the sake of his unborn child, he insisted he couldn't stand her, she was trashy, never had a job, lived with her mom, was on disability for a "bad back". im not dissing anyone for being on disability, but I'm disabled myself with a vascular disease and still work. Fast forward, the baby is born, the girl leaves the baby with him basically made excuses why she couldn't take this beautiful baby boy. So as a friend and a mother myself, he asks for my help! Thats when I fell in love with him and his newborn son! 3 months go by and she shows up at his house with the police saying she wants her baby back! coincidentally, the next day she files for child support! They go to court, he fights for custody for months, she gets good money (he has a good job). Meanwhile we are officially together, he moves in and 2 and a half years later engaged (wedding in July), 5 months pregnant with his daughter, looking for a house to buy and raising our boys together (my sons father is not in his life). His ex (if you want to call her that) really is a low life! As a mother I totally understand my boundries, I am not his real mother, never will be, but I love him and treat him as my own! I have been there since he was 3 weeks old and he is now 2 1/2. I cuddle him, feed him, bathe him, I kiss his boo boos and kiss and tuck him in at night, I make sure he has wonderful holidays with us, I planned his 2nd birthday myself! My fiancé and her have joint custody right now and she has placement with a nice big child support check (along with welfare, free medical, her ssi, and foodstamps) shes living the dream (she thinks)! The thing is we only have court ordered weekend visits BUT EVERY single weekend something comes up with her and we have him 4 to 5 days a week! Its fine with me! I love him! but we both work full time and are constantly rearranging our schedules and finding sitters, quite a few times we had to take turns calling out of work because she refused to take her son back! meanwhile, she STILL gets a nice fat child support check even though we have him 75% of the time! She also refuses to meet me, puts me down and calls me shitty names to my fiancé, really childish things! I've had it! My fiancés son LOVES me! but this past weekend he was acting funny (hes now 2 1/2 years old) he wouldn't come near me and he always says I love you to me, he said his momma said not to talk about me and if he does say my name he said "momma say no and momma smack me". My heart sunk! I know he's only 2, but he said it again the following day! it makes me sick! I can't belive someone would do that to their own child! We are waiting till we buy this house and when we marry to go back to court and fight again! but I just don't feel comfortable about him being at his moms now! it kills me!