Pity Party, Not Pity Roommate
The last thing you should do when you are in emotional pain is bottle up your emotions and refuse to deal with them. Suppressed emotional pain can lead to depression, but even if you escape serious mental health issues, ignoring your feelings sets you up for trouble. Eventually, you will reach your breaking point and be unable to hold it back any longer. The floodgates will open, and you will randomly burst into tears at work or start screaming at the poor cashier who asked if you had any coupons.
Admitting to and accepting your pain, however, is not the same as asking it to move in with you. Avoid listening to sad songs on repeat, and resist the temptation to fill your social media with sad quotes about breakups. Do not be afraid to cry when you need to, but make sure that when the tears are done, you pick yourself back up. There is nothing you can do to change the fact that life has knocked you down. You can decide, however, how long you stay down.