Some people, after a loved passes, can't seem to cry at all.
If you aren't able to cry, you might worry that person will think you didn't really care about the person you lost.
The body has many ways to deal with painful feelings. Some people feel that they are drowning in an ocean of tears. Other people feel all dried up inside like a desert. Everyone feels grief a little bit differently.
You don't need to try to force yourself to cry. When your tears are ready to come, they will.