Need outsiders opinions please!

My fiancé has never really had a lot to do with his Mom. When I first met him, he spoke quite badly of her. He even stated once that he would much rather invite his stepmom (who beat him!) to his wedding than his own mother.

But anyway, I went on to have the occasional dinner with his parents, even though she really hated me before she even met me (she told him this).

A few months after our son was born, she was a real bitch of a thing to me and her daughter threatened that they would take our son away from us to live with them so that they could see him more than the once a month that they did. I politely told her to try me, and then refused them seeing him.

After things settled down (couple of weeks), I decided to work things out between us for the sake of my fiancé. A date and time was set to sit down and chat, but a couple of hours prior, she and her husband messaged us saying that they had more important things to do (they went out partying), so I took that as my baby boy was not important enough to her.

After that, she talked a lot of shit to people around town, and that just aggravated my fiancé more. Especially when she started talking shit about my Mom (who took my fiancé in 1 month after we started dating because his Mom kicked him out over supposedly stealing a loaf of her bread; and she paid over $1000 to fix his car, etc). And not only has my Mom done a lot for my fiancé, she also stuck up for his Mom. So the nerve his Mom had to talk so nastily about her REALLY pissed us off.

So we didn’t hear from her for ages, until our daughter was born (he refused her call), and decided HIMSELF to block her on everything, and not visit her.

We split for a few weeks, and not once did he contact her then either.

Fast forward to last night. He ran into her at the shop, and she asked him to bring the kids to see her. He said he wouldn’t unless she talked to me about it, and then when she asked if he and her had beef, he said NO! To me, he made it sound like it’s all my fault that they haven’t spoken or seen each other. Yet, mind you, I was the one who said he should at least say happy Mother’s Day and happy birthday to her, but he didn’t. And then when I told him his little sister asked if he would like to spend Christmas morning with them, he said there was no f**king way in hell!

So, am I wrong to be mad? Or should I be telling him to man up and tell her how he really feels?!