I asked my boyfriend when we'd only been together a couple weeks, then again at probably around six months, and now we're pretty solidly agreed on that we want this to last as long as it can.
Some of the awkward was avoided in that I asked online, but I wouldn't recommend that. The only reason I did is that he lives about three hours from me, and if I was trying to work up to talking about it in person I'd lose time actually together, not to mention the main reason, which would be that I wasn't going to see him for another month or so.
We were pretty young (we still are, but then we were only 16 (me) and 18 (him)), so i asked him, the first time, if it was just a fun teenagery thing, or if he wanted it to last more than a couple months. We agreed that, so far, wanted to stay together.
After a couple months, I think he brought it up with me, but I might've asked him, and we discussed it more, and both agreed, as I said before, let's try to make this last. A while after that, it just became an assumption that we will, and we express the sentiment when we're talking about the future (ie, when I graduate from university, where each of us want to live when we have more money, etc, whether or or not we started the conversation meaning 'together')
So, seeing as you're worried about seeming needy, I'm going to say you want to stay in the relationship. Were I in your position, I'd ask him if it was a fun, temporary thing, or did he want it to be a (still fun) serious relationship.
But I'm young, so I don't mind if you disregard me, and I understand if you do