Okay i tried too make it...

Not trying to ruin anyone holiday but this may be a tad long, please bear with me. Itried too make it through the entire day without being moody, sad, a Christmas spoiler! Whatever you wanna call it, but how can you deal with being in relationship with someone having not one but two kids together and he doesn't invite you too holiday gatherings anymore.. ever since he had his little encounter after we broke up for half a year 2017 (which btw she now has his first born son) but yea ever since then I no longer get invited too anything anymore by him instead he lies too me (which I later find out by being the spy that I am smh iknow it's not healthy please don't bash me) anyways he lies too me and say she's not going too be there only for me too log onto Facebook and see pictures of her and his sister together and me feeling like shit because that use too be me. I may sound like a crybaby but before she was around I was at EVERY gathering now noone even bothers his sister who once use too be my 🤞 is now very distant and rude with me and rather have him with her. (Iknow this because I've seen and read certain shit and he's also told me she's on her team). Ihave not done SHIT wrong ilove my other family with so much in me but I can't stomach the fact of that I'm not wanted around anymore by him and his family. Not too mention that today he tells me asked me "What time is your nana going to your cousins"? I go "why" he says "so you're gonna sit here at home by yourself all day because me and renny(my daughter) isn't gonna be here" you guys smh what do I do??? Idk why but that really hurt me mainly because I wanna know what's the problem with me and also because in the back of my mind I know his other baby mama is gonna be there with his son and around him and his family when that's supposed too be me. The only one who talks too me still with no problems is of course his mom she's always told him and me both I'm the only one she would love too see her son happy with I've been here through his wake up calls (he was shot and hanging on by dear faith 3 years ago) I stuck right by him the entire time. Smh any advise? It'll help please. I'm also currently 22 weeks pregnant with our second baby girl that's the reason I'm overreacting maybe.