Why my fiance hasn't wanted to ually active with me?

ok well me and my fiance used to have at least 2 tims a day and now i rarely get it maybe like 1 time every 2 or 3 weeks and i don't know why is there something wrong with me does he need to be with someone more attractive or i was thinken it might have changed due to the fact that we had lost two children cuz i have trouble carrieing full term and i think he blames me for loseing our babies and even though he knows i have a medical problem with going full term i can feel it in my heart that he blames me cuz you know when u really love someone u can feel those types of things and to be honest i cry myself to sleep sometimes cuz i feel as if he doesn't love me like he used to he used to adore me and never wanna be away from me but now it's the oppisite way around he even verbally abuses me and puts me down nd then he tells me he only does it cuz he knows it hurts my feelings so please if there is anyone out there that can try to help me well at least give me some advice please contact me i really really need some advice on hwat to do and some hlp to figure out if he really loves me cuz there is another part to our lives he has two other kids from his ex and even tho me and my fiance have been together for goin on 5 yrs she still insists on trying to get him back like right now she won't let him see his kids untill i am out of this house but that will never happen cuz we pay for this house together and there's nuthin she can do about it as a matter of fact she can be held in contempt cuz she is not obeying the court order but i don't know what to do for my fiance cuz we don't have the money for the lawyer agiagn to take her back to court but even if we did it always seems like the mom wins in these kinds of cases i would just relly love to figure something out so we can get full custody of his two childeren with his ex cuz i feel so bad for those kids they call our home everyday crying cuz they wanna come see me and their dad and the worst part of it all is the kids are only 4 and 7 and when they tell me they love me or miss me around their mother they get in trouble for it and i just dont get it they need to be in a better enviroment and i honestly think she wont let them back here till i am gone and with th way my fiance has been actin toward me i think he's startin to wonder if it would be better if i just leave so he can see his kids but the thing he dont understand is that when we lost our 2 babies especially our first cuz i was further along with her and actually had to deliver her but anyway when that happened i noticed it brought me so much more closer to him then i was before that happened but him now i noticed it seemed to push him away from me now with myboy it wasn't that bad cuz i wasn't that far along but when i try talkin about our baby girl we lost he gets very angry and tells me to shut up i just dont know what to do naymore about the situation i know this sounds selfish but when i have to be around his other two kids from his ex i get really extremely jealous cuz it seems like everyone is just trying to shove it in my face that they have kids and i don't and i found out that right after i lost my first baby my fiance had the nerve to laugh about it with someone she knows i just wanna know if he really means it when he says he wants to keep trying to have a baby with me it's just hard for me to believe cuz i just got home from the hospital after delivering my baby girl and he couldn't even tell his ex he needed to switch visitation days cuz we just lost our baby and his excuse was that he was scared that she was gonna run back to her lawyer or whatever and say he was already breakin the custody agreement but i am sure they would have well understood why he wanted to switch so i had to be around kids the day after i lost my own baby and that was in 2007 so his kids were younger then so that made it even harder on me and the whole time they were there he didn't have the common courtesy toask me how i was doin if i was ok all he cared about was his two kids that he can have unlike me i am sorry i am writen so much i just really needed to get this off my chest and i don't have anyone at all to talk to around here he just tells me to shut up and i'm a depressed retard cuz i ain't done greiven over my baby girl yet but it's only been 2 yrs and i feel as if i should be allowed to tke as much time as i need but anyway if you have any advice for me please contact me what i really need ta know is why he doesn't wanna have wit me anymore the way we used to is he scared i might get pregnant and maybe scared i might miscarrey agian and he don't wanna go through it agian cuz i know it was very heartbreaking for him when he saw me deliver her well if anyone has any answere's for me please write me back thanks alot i hope to hear from someone soon