Being hurt by someone can destroy trust and erode a relationship, and this can also lower the self esteem and confidence of the individual who is feeling the pain. Once someone has caused emotional or physical pain this can be very hard to recover from, and it may take a significant amount of time for things to go back to normal if this is even possible. Being hurt by someone can refer to infidelity or another type of betrayal, or it can refer to physical injury and abuse.
Staying in a relationship just because you love somebody is not worth it.
Expect the best, be prepared for the worst, screw what others think, and just do your own thing.
A person who hates everyone now, once loved someone too much.