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Q2. Yes. Caveat. Don't take this the wrong way. A lot of relationships don't work out till the mid 20's for most people. It would be hard, but try to gain some independence first. Your partner can always help you out with the difficult stuff but you will feel better having a place of your own.
Also, if the worst comes to the worst in your relationship. You won't have any problems with finding somewhere to live, if the worst happens.
If he is "The one" then go for it, but don't let your living situation make things difficult on your relationship. Talk it out with him and see what your partner thinks. The last thing he wants, is for you to just turn up one day at his door, saying you're homeless. He might want you to move in, but that isn't the right way to go about it.