Leaving him because of his family?

I’ve seriously considered leaving my fiancé because of his family, and his reaction to them. Is that wrong? I’ve kind of talked about this before but I’m hitting my last nerves. I’m exhausted. I have no support.

They’re always doing something horrible and are the most toxic people I’ve ever been around, yet he always excuses, forgives, tolerates... with no consequences or anything.

Most recent is his sisters been telling everyone I got knocked up on purpose by secretly stopping taking my birth control. I was 19, broke and in college trying to get my bikini body so no, that wasn’t my plan. I was on the pill taking it every day. So that is a horrible rumor. She’s the worst kind of female too so I don’t know why anyone even believes her anyway. But they do. They believe her over me who’s done nothing wrong.

His other family members treat both of us like crap. They ALL say horrible things about us, about our jobs (he’s a Plummer and I work in emergency medicine) and about our parenting.

Now that our son is growing up (he’s almost 2) they treat him like he’s nothing. Pretend he doesn’t exist. Blow off all our birthdays, our graduations. Even if they hate me, why blow off your nephews birthday? He’s only 1!

The worst part is my fiancé excuses all of it. His sister who told everyone he failed his exams, talked bad about us, brought our son into insults, blocked him on all social media etc... texts him within hours of me finally telling her to leave us alone after she hasn’t even talked to him for months (she’s not popping in and out of my sons life like this anymore). Coincidence? Nah. But he goes along with it just like he has with everything else.

I’m a nice person and can get along with everyone in life except them because they hate me for god knows what reason. No one ever has a problem with me in life besides those 10 people so it’s not just me. But it still gets to me, and makes me feel like shit and i can’t get away from it because he insists these people stay in our lives. I’m so stressed, I can’t sleep some nights and I’ve actually lost friends elsewhere because of how intense the lies are that they tell to anyone who will listen.

Half the time I feel like I’m drowning in this shit because we get over one thing and something else happens! I’m ready to up and leave my fiancé because I feel like he should help me but i feel like he’s pushing me into the snake pit every time and walking away! I love him but I can’t handle this.