I think the worst thing we can do to our partner while in a relationship is to intentionally hurt our partner. Lying in my opinion is acceptable in some situation but it is not encourage. We have to lie or I would call white lies if necessary. If our motive is good in doing that to keep him/her from hurt, whatever your reasons are as long as you know you’re doing that for the sake of your partner. It’s your/our own judgment and no one can tell you it’s wrong.
But, if someone is lying because he or she is trying to cover up his/her cheating ventures, that’s not acceptable because the cheater knows that he/she is crossing the line in the first place and going to hurt his/her partner--the issue is when his/her partner will feel the full blown impact of that covering up and the longer the cheating is being covered up, the more painful impact it would be to the other partner, when the cheating is revealed or discovered.
Abuse? I can’t imagine the person I love to be bitten by mosquito, how much more hurting or physically hurting him or her. No matter how I love the person, when he started to hurt me physically will be the end of it. I don’t know I just can’t entertain the thought of being beaten physically, how much more being abused by my partner. It’s making me insane just the thought of it. So when and if my partner I strongly believe is showing that sign or heading that way, believe me, I'm already out of the house far away with my children of course. I just can’t tolerate the thought.
The bottom line, the worst thing we can do to our partner while in a relationship is to hurt them emotionally or physically.