We are only human, so of course we make mistakes, which brings out the dark side of a relationship. It is likely that you will encounter the light and the dark side of relationship throughout the course of your life. It’s just the nature of things.
Now you may think that a little lie here and there won't hurt the relationship but that's not always true. However, don't take my word for it. How would I know, right? I'm just a college student trying to express my opinion through my words. Lying to protect your partner may not always be the best idea. It may not be the "dark side" of a relationship however, it’s just better to keep it clean with your partner rather than lying.
We tend to lie more during the initiating phase of a relationship.
- Knapp, 2006.
A lot of people lie on a daily base. Late to work? Just lie about train delays. Easy, right? However, we try not to lie to the people that we are close to. What about sexual and emotional cheating? That's something people really do lie about, but this is more than lying. Sexual activity with anyone other than your partner is cheating, and so is getting emotionally attached to another person and thinking romantic thoughts about them. It's considered cheating regardless, unless you are in an open relationship, then knock your selves our ladies and gentlemen.
Most importantly, showing anger and aggression really is the "dark side" of relationships. Abusing your partner, verbally or physically is the worst thing you can do. We often look at the psychical aspect of the violence, but verbal is just as important. Like today, when my friend told me I'm verbally abusive, I immediately messaged my significant other to ask if that was true, and they denied.
The main point of this whole thing is that don't let your relationship reach the "dark side" because it’s hard to come back from. Talk to your partner; communication and trust is the key to having a healthy relationship.
Knapp. 7.6 The Dark Side of Relationship. University of Minnesota (M.Libraries).