Were you and your partner a pair of social butterflies? If so, your breakup might leave you wanting to crawl back into your cocoon where you can avoid all of those "Where is so-and-so?" questions until the memory of them has faded from your friend group. Throw on your bathrobe and do it. No judgement here.
On the flip side, if you were already the homebody type but now sitting solo on your couch is a little too much to handle, it's perfectly OK to go out and paint the town red. Sometimes a break from routine is exactly what we need to shake off the blues after a relationship ends.