RENA

“What if I slept a little more and forgot about all this nonsense.”

…

Apparition in the forest (from Sleeping Beauty)

These are the aspects that, in my opinion, can be signs of continuous fights, challenges in a relationship, whether it's platonic or romantic.

It is not a sign that the relationship is fated to end - that depends on other aspects and placements, but it can show that there can be struggles, especially during times of tension.

Mercury square Mars

Possibly the biggest sign of verbal fighting between two people. It can show impatience with the other person. The Mercury person may try to provoke the Mars person just to get a reaction - they know they will. While it's a sign of bickering, at times it can lead to things getting out of hand, especially when the Mars person has had enough. Both people may bring out the blunt side of each other, regardless of how it may hurt the other person.

Mars square Uranus

Although it's not a sign of constant fights, when the two have one, the Uranus person is likely to take action that may be sudden, unexpected, out of character. They may try to bring the Mars person out of their comfort zone, push them until they have had enough. This aspect can really make fights have very unpleasant or unepected endings. It's very chaotic.

Mars square Pluto

Fights here may make the relationship suffer for a long time - the Pluto person is never really over a fight, whether it was their fault or not. Fights and turmoil may have a lasting effect on the relationship and things may never feel the same, especially if Pluto's trust was broken.

Mars square Saturn

While this isn't an explosive placement, it can be one to determine the future of the relationship when it comes to disagreements and important decisions. Both Mars and Saturn are self-righteous and unwilling to compromise. In fights, people will this placement are likely to choose their personal pride and dignity and never talk again due to their stubbornness.

Mars in the other person's 1st House/Mars conjuncting their Ascendant

While it can be a sign of great physical chemistry, similar energy, sexual-physical attraction, it can also show that you may be very competitive with each other rather than supportive. It may feel childish - rather than inspired by the other person, you may feel jealous and doubtful of yourself.

Mars in the other person's 7th House

Any planets in the the other person's 7th House are really felt in the relationship - the planet person is the one who brings that planet's energy into the relationship.

While it can make the relationship very passionate and physical, Mars is also the planet that brings destruction, violence, aggression, dishonesty. The Mars is assertive and that is felt in the relationship - they may be the one to lead, they may want things to always be their way. There can also be competition in the relationship once again.

Uranus in the other person's 7th House

While not a sign of aggression, it can be a sign of bringing chaos into the relationship, good and bad spontaneity, the Uranus person may bring lack of stability into the relationship, the House person will never know what to expect from them and they may be hard to rely on.

Saturn in the other person's 7th House

The Saturn person may bring certain boundaries or restrictions into the relationship. It may take a while before any warmth is felt, the Saturn person may have a steady approach for the relationship which may come off as cold, distant, like you're not partners with them, but it is some kind of official meeting. They may bring their personal pain into the relationship, whether it's cautiously or not. In some cases they may also be controlling - similarly to Mars, they are likely to want things in the relationship to be done their way.

Pluto in the other person's 7th House

There can be too much control in the relationship, jealousy, mistrust and doubts regarding the other (especially coming from Pluto's side). This aspect can often trigger both Pluto and the other person when it comes to how they handle small issues within the relationship. Things are never going to be forgotten, both people will have an immense impact in each other's lives.

Honorable mentions are:

Anything square Neptune (Mercury,Mars) can bring manipulation, unrealistic expectations and illusions, lies.