It is not always easy to determine in the early stages of a relationship if one person will become abusive. Domestic violence intensifies over time. Abusers may often seem wonderful and perfect initially, but gradually become more aggressive and controlling as the relationship continues.
Abuse may begin with behaviors that may easily be dismissed or downplayed such as name-calling, threats, possessiveness, or distrust. Abusers may apologize profusely for their actions or try to convince the person they are abusing that they do these things out of love or care. However, violence and control always intensify over time with an abuser, despite the apologies. What may start out as something that was first believed to be harmless (e.g., wanting the victim to spend all their time only with them because they love them so much) escalates into extreme control and abuse (e.g., threatening to kill or hurt the victim or others if they speak to family, friends, etc.).
Sources: The United Nations, National Coalition Against Domestic Violence, National Violence Domestic Hotline and Office on Women’s Health, U.S. Department of Health & Human Services, U.S. Citizenship & Immigration Services.