You have been very strong. It's natural to have bursts of sadness and tears. We have lost something very big in our lives, it's like a death, and in some ways much worse.
Be kind to yourself and let the tears flow for a while. There are stress hormones in tears that are released when you cry, so you feel better and more relaxed afterwards. Maybe distract yourself with a funny movie or some upbeat music or intense sports, and notice how our feelings can change within minutes...
M 16 yrs, WH62, P54 3 adult blended kids EA 11/13, BD1 6/14 PA fall 14, BD2 2/15 Piecing 2015, BD3 12/15 Separated 4/16 WH moved OW in 5/16 Divorced 6/15/17