You are getting a lot of flack on here op but having read your opening post again, I admire your honesty.
It’s usually not good though to avoid making a decision because of the fear and uncertainty that lies on the other side of it.
That’s easy to say though when you don’t have a three year old to look after. You have to consider everyone in the picture, not just yourself, but children mostly do well when their parents are happy.
And why is your only other option moving back in with your parents? Could you move somewhere cheaper or work on your career so you can afford somewhere of your own?
How do you think you would cope living and working alone and being alone with your child at night, doing the school run alone, having to cope with illness alone? Or would you rely on your parents for that? It’s not easy to go backwards in life sometimes. And what about the impact on your parents? It’s a big thing you would be asking of them.
The other consideration is your partner’s anger issues and PTSD. It’s not good that you are walking on eggshells and don’t feel you can be yourself around him. Is he getting help for that? If you and your partner split, would you be happy leaving your child with someone with anger issues?
My advise would be that whichever decision you make, you both need to discuss it between you and own it. And take responsibility,
So if you get married, he needs to take responsibility for his anger issues and treatment for his PTSD and get less serious and find some other hobbies other than watching the news. Is he depressed do you think?
And if you get married, you need to work on your sarcasm and get some therapy to find out why your partner turning 50 “freaks you out” as that is not a normal reaction. You need to work out why his age has always been an issue for you?
Because that one is obviously not going to get any easier and the difference between fifty and sixty is quite significant. There are lots of older dads out there now though!
Also, can you work on becoming more independent?
Could you go to couples counselling and work on really being loving and understanding towards your partner? Love is a verb after all. What caused his PTSD for example? Can he talk to you about it?
Could it be you settled for your partner because you wanted a child? And now the consequences of that decision are impacting you? If that is the case then it would be wrong to use him further,
Maybe the freaking out is the realisation that you actually don’t want to be with him any longer? And in those circumstances, it would be hard to feel good in yourself, if you know you are using your partner without having any respect for him? If you do that, you might lose respect for yourself too. And splitting up when your child is older might be harder for them.
Just throwing all of the above out there as food for thought op. Good luck with your decision. Whatever you do, own it, don’t stay with him and feel resentful. If you decide to stay, it needs a proper commitment from both of you to do better and spend time together, and get baby-sitters and go out regularly as a couple without your child. If possible, get back to a proper loving and supportive relationship. If that’s impossible, make the hard decision and do the hard thing. 💐