<p>put my vote in the "bad idea" group.</p>
<p>HS students aren't used to sharing a room so if they do it with a stranger they are usually respectful of each other which makes it work out ok. You don't need to be friends at all with your roomate, its just a shared living situation. Of course many roomates do become good friends.</p>
<p>The problem with HS friends is three-fold. First since they already know you its easy to assume you'd be ok with stuff they would pause before doing with a stranger -- borrowing things, having people over at all hours, etc. This causes friction. </p>
<p>Second, when things bug you it turns out you're in a funny limbo; it can be easier to discuss things with a relative stranger since it can be neutral; you do A, I'd prefer you did B or C, can we work this out? It can be harder to raise issues with a HS friend since you already have ties, mutual friends, etc. And to be honest, how well do you REALLY know your friends? You might hang out daily, but at the end they go to their place and you go to yours. In the dorms, you're both going the same place. </p>
<p>Third, college is a time many people reinvent themselves. Most HS's are insular and you see the same people who you've known forever. In college you can break out of the mold everyone saw you in back in HS, but having a friend in your room who knew you one way and wants you to stay that way can cause trouble.</p>
<p>And to address 2 things you raised, most people are going into ucla not knowing many if any people; the first few weeks all the frosh are looking to meet people, and not having a HS roomate to fall back on is going to help you be motivated get out there and meet people.
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The hard part would be telling him I wouldn't want to room with him if I decide to go that route.
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As for telling your friend, it doesn't have to be "I don't like you, I'm rooming with someone else". It can simply be you saying you want to experience a fresh start at ucla and you'll be of course seeing him around on the hill. And this actually should be a red flag for you; if its difficult to discuss where you want to live (and with whom), what about dicier conversations? If you think his girlfriend is spending too many nights? That you don't like his new drinking or drug habit in your room? While I'm not saying this will happen, it does often enough that you need to be able to know you'll bring it up instead of suffering in silence.</p>