Some would say that insects do not have emotions.It is due to the fact that emotion is not usually associated with insect per observation. That could be due to the inability of the insect's exoskeleton to move muscles' surface and skin that one can interpret as a smile or other facial emotion.
The reflexive insects' reaction to environmental cues are usually not interpreted as emotion. Science suggests that insects reactions are simple reflexes. In humans, emotions are associated with the release of a chemicals called endorphins in the brain. Endorphins have also have been discovered in the insect brain. So if human is feeling happy, there is a release of endomorphins. In case of insects, is release of endomorphins mean just a reflex? If that a case, we can think that human release of endomorphin as well is a reflex? Well, science needs to unveil th etruth on that.
Insects do have feelings but they feel things very differently from the way you or I do. Generally we understand that lower forms animals like insects appear limited to sensation. But social insects demonstrate advanced learning capability which was previously thought impossible. By certain movements of the body and of parts of the body, especially the wings, antennae, and jaws, and by sounds made by various organs in sundry ways, they convey to one another the primitive and simple emotions of their hind and of all animate beings. We may not understand but surely insects do have feelings that could be understood by them.