Need advice!

Hey guys! Need your advice on something that me and the boyfriend have been discussing for a long time. My boyfriend is 5 years older than me, has his life set in stone from here on meaning.. he has a job that he loves and makes good money in, he just bought a house, he is looking for a roommate (specifically only me if you catch my drift.) I am in a position in my life where I want to move back out and can afford (awesome state job, in my last semester of my degree, and just got my finances perfected) to but me and the BF figured instead of waiting to move in with each other which was destined to happen to just go ahead and do it. ANYways. My parents are super duper old fashioned folk and I guarantee wouldn’t approve of me moving in with my BF. Has anyone out there been in this situation and can kinda explain how you still maintained a good relationship with your parents?