And now I need to watch Lord of the Rings lol. You're very welcome hun, I hope if you ever feel like you need a local(ish), sympathetic ear to listen to you vent/rant/scream or commiserate with you, that you'll get in touch.
Whilst I can't claim to have been in your exact circumstances, I ended up walking away from my ex fiance who I was with for 7 years.
It wasn't because of his mum at all but because of how he was & how I ultimately felt more like his mother! I felt like I was having to demand things from him & give ultimatums for things that I shouldn't have had to. Like him needing to get a job to help pay the rent rather than sitting on his arse playing Fifa all day long to the the level of ridiculousness that was me stating I wouldn't sleep with him or even kiss him ever again if he didn't brush his fucking teeth or shower.
I came to the realisation that I deserved better. I deserved a real, true partner who was willing & capable to be my equal in our relationship, not someone who I had to nag into doing everything. I needed & deserved someone more mature.
Whilst lamenting about my useless fiance at work one day, this guy who was working as a locum there that day said that I should ditch my pathetic fiance & go for a drink with him. That guy is now my husband & we've been together 10 years this year, married for 7 & have a 3 year old daughter. He is everything I wanted in a partner. He's an adult, not an overgrown teenage boy or a mama's boy.
Granted he's not perfect, he has man-child moments like every man does & can drive me up the wall but I can hand-on-heart say that I've never had to demand stuff of him or give him any ultimatums. We moved in together after 2 weeks because it felt right.
Sorry for the essay on the history of my relationships, I get very wordy. I just recognise how hard it can be to even think of walking away from such a long relationship when you've invested so much time, effort & love into it. It's like walking away from your entire life. For me there were also the thoughts of "Oh God, but I'll have to start from scratch with someone new again, what if it takes years to find someone", "Maybe it's better the devil you know", "What if I never find someone, I'll be a crazy cat lady" etc etc. Not to say that you are having those same thoughts but though it's easily said on JNMIL that it's easier to dump a mama's boy than divorce one, he's still your fiance & someone you've clearly planned on spending the rest of your life with.
I wish for you to have a lovely Easter weekend with no dramas or aggro & lots of chocolate (if that's your thing) xx