I have learned the hard lessons. I have had bad experinces too.
I have the advices for you that may work for you:
DO NOT ATTEMPT live in with your partner ever. DO NOT ATTEMPT have sex with anyone at all.
BECAUSE IF you want to keep a good person in your life, Do not have sex or move in together either.
Why? sex is dangerous and living in with someone is not a good idea, can ruin your life also.
Marriage and Common in Law both are the same and make no differece. People get divorced everyday anyway.
People breaking up their relationship everyday.
Why? men are a@@hole  and men don't know how to treat right and men do not know how to love either. Men like to use women
whatever men need to. Men are so selfish and are so pig.
Go live alone for rest of your life. I know life sucks. so sad anyway.