It depends on what your love relationship is, and it depends on who the enemy is/what the enemy has done. This could beg the question "does might make right?". "I declare war and because it is war and I am strong I, therefore, can do WtF I want." Is war just, though?
My dad giving me advice has quoted: 'All is fair in Love and War.'
In an ideal world no there would be justice.
But we don't live in an ideal world.
So although we are good people and want to do the right thing. Others might be more aggressive in their pursuits and could wrong us to win and get what they want over you.
For an example imagine you're going for a job interview. And you get talking to the other guy in the waiting room.
And when you get into the interview the interviewer asks what you think of your competitor.
And you say great guy but he's got small children he needs to take care of. And he studied hard and needs and deserves this job because of this and that reasons he gave you.
Later you're told you didn't get the job but he did. And so you stay on low wages for long hours. And he gets into the pound seats.
I think the right answer would have been that yes he's okay but I'm better for this job because I.. And you sell yourself over him as he would do.
Unfortunately that's how the world works right now. It can be dog eat dog. As in nature it can be cruel and harsh.
To quote Father Satan on creation and destruction but not rote. This is not word for word but the meaning, the gist of it:
There are better ways of doing and being but until that time comes. We are in this world and because we are part of this world. We will have to operate the way the world does. So create with all your joy and might. And likewise destroy with all your joy and might. And in the future a time could come when we don't have to be do things that way anymore.