Suicide bombings have long been one of the Taliban’s main instruments in harassing American and allied forces and inflicting fatalities.
In what is speculated to be the first of such an attack, the man embraced his alleged lover, killing them both.
Islamic State claimed responsibility for the attack via its official Amaq news agency.
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Ten people have also been injured in the attack.
Two bombers attacked buses carrying police cadets on their way to the capital on Thursday, killing 27 people and wounding dozens more on the western outskirts of Kabul.
A faction of the Pakistani Taliban has claimed responsibility for the blast, which targeted a park crowded with families celebrating Easter.
A Saudi production company has sparked outrage by tricking people into believing their taxi driver was about to blow himself up with a suicide belt.
The coordinated assault by suicide bombers and gunmen has left at least seven dead, including five attackers. An Islamic State-allied news agency has claimed that the group is responsible.
The attack on Wednesday reportedly involved a suicide explosion within the mosque that was soon followed by a car bomb that hit medics as they worked outside the building.
Insurgents clashed with security forces near the Kabul airport, attacked a military base, bombed a residential area, and killed recruits at the capital’s police academy.