Am I jealous or are they mean?

I was diagnosed with pcos almost ten years ago. Being told having a child will be nearly impossible nearly drove me into a deep depression. I went on hormone therapy for years and the dr said I was doing so well he was going to take me off of it and could be pregnant within the year (over three years ago). A year to the day almost, I had my first miscarriage on mother’s, day of all days, and have had four since. 

I am now in a relationship with my man and he has not one, or two, he has three babies, with three diff women. ((My previous relationship I was a step mom to two little girls and loved every min of being with them)). 

I’ve been with my man now for almost a year. I’ve seen his 4 yr old a handful of times and his youngest once. His oldest lives across the pond(so never seen her...). 

When I first asked to be apart of the 4yr olds life cause I want to build a bond with her and not miss out on these precious moments we won’t get back, the mama basically told my man that I’m not to be apart of her life untill she deems acceptable. This I understand but at the same time, we live where we live because of me. We have the life we have due to both of my mans and my effort. I’ve sent many gifts and gone out of my way the two times they have been here to go shopping and make snacks and what not. 

I feel in my heart of hearts, since having my own may not happen I’m mad at him that he doesn’t stand up for me being more involved in her life. 

The other baby mama doesn’t want anything to do with me and has instigated that my man and I have problems... which we don’t. She even messages him asking about us. Let y’all know she was with him for less than 2 months just to make her ex jealous and then got pregnant and went back to him. The ONE time she came over, she just whipped her boob out, no blanket no nothing, in front of not just him, his two brothers, grandfather and a complete stranger. 

I’ve done nothing but be nice to both of them and I get nothing but being ignored or being told I’m not to be apart of visits or anything. 

I will say that over the last month his 4yr old baby mama has been a little more nice, I even got a hug last time we saw eachother. 

None the less I have never felt more out of place or just ¿disrespected? Ignored or sad. 

I’ve talked with my man and he knows how much it hurts that I only want one of my own and it’s slim to none chance we have one, I’m only getting older(31)... 

Okay so now that my rant is over... I just need some outside perspective... 

Am I just jealous? Or are the baby mamas being mean??