At 2pm you can almost convince yourself you are doing fine. At 10pm the same breakup can feel like it happened five minutes ago. That change does not mean your recovery disappeared during dinner.
Night removes a lot of the things that were carrying you.
Work ends. Messages slow down. The gym closes. Friends go home. There is less new information competing with the memories.
And if evenings used to mean calls, lying next to somebody or watching something together, your brain is not only missing a person. It is noticing a routine that suddenly stopped.
Attachment can make distance feel urgent.
If silence immediately turns into a need for reassurance, Attached (affiliate link) on Amazon can help explain why distance sometimes increases the desire to reconnect instead of reducing it.
Give the evening a different physical shape.
If you always sat in the same place and did the same thing together, change something small. Read somewhere else. Move the chair. Go for a short walk before you settle down. Put a game on with other people rather than watching the programme you always watched together.
Comfort is allowed too. If physical restlessness is making the evening harder, a weighted blanket (affiliate link) on Amazon may make reading or watching something feel more settled. It is comfort, not a heartbreak cure.
Have a rule for late-night contact.
Something simple: no messages after 9pm. Anything you want to send goes into your journal first. You can decide again in daylight.
The version of you lying awake looking for relief does not need permanent authority over tomorrow's situation.