Important warning signs that you may be involved in an abusive relationship include when someone:
harms you physically in any way, including slapping, pushing, grabbing, shaking, smacking, kicking, and punching
tries to control different aspects of your life, such as how you dress, who you hang out with, and what you say
frequently humiliates you or makes you feel unworthy (for example, if a partner puts you down but tells you that he or she loves you)
threatens to harm you, or to self-harm, if you leave the relationship
twists the truth to make you feel you are to blame for your partner’s actions
demands to know where you are at all times
constantly becomes jealous or angry when you want to spend time with your friends
Verbal and Physical
Verbal abuse can be worse than physical abuse and that is dependent on the years of abuse. Abuse is the way you treat (a person or an animal) with cruelty or violence, especially regularly or repeatedly. Abuse takes the form of physical and/or verbal abuse.
I recommend reading the book Boundaries written by Cloud and Townsend.