You certainly need space, before you can start. When my first serious relationship broke up, it was a 5 year relationship (since my first year of HS) and I was in college. It was towards the end of the year. When I got home for the summer, he was wanting to hang out with me *all the time*, calling me almost every day, because we were friends so of course that was fine. After about a week of this, during which time I said no, was legitimately busy, and went out with him (with friends) once, I had to lay out really specific ground rules about what kinds of activities and groups he could invite me along to. Like: big party with his college friends, who I'd met and formed separate friendships with? Yes please! Hanging out at the house of his high school best friend, who I didn't really like? Don't even bother. And even with Yes Please people, no more than once per week in most cases. It took about the rest of that summer for things to settle down into a place where we really could be just friends, but after that, I enjoyed seeing him at events our university Christian groups did in common, and occasionally, with friends, when home on breaks.
We'd probably still be doing that, except that after I graduated (3 years post-breakup) he wanted to get back together and I said no, and that rather killed things. We're both married now, so perhaps if we ran into each other at some point we could be friends again, or at least good acquaintances.
That was all rather long-winded to say decide what you want and need, and execute it, but absolutely *take a break* first, especially from doing things you frequently did as a couple.