Even when they have their own.
I hate mind games.
Ive always been a firm believer of just saying something to someone.

God and Man
If I like you, Ill tell you.
If I dont, Ill stay away from you and only talk to you if its an absolute must.
And I expect the same of other people and I think this is my problem.

You see, because I expect the same from other people I have become easy to manipulate.
I take things for face value.
I look at people and give a shot to see the best in them first.

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Even when they have their own.
Firstly, they are now committed, respect that they are and they are happy with who they have.
In my eyes, a guy with a girlfriend is as good as married.
A girl with a boyfriend is as good as married.
They are not fair game whatever the hell that is.
They arent automatically available because you knew them first in the capacity of a work colleague or a friend.
They arent your property or your territory.
Get over yourself with that attitude.
Not only is it morally messed up, people simply do not belong to other people.
Talk to your partner.
Tell how you feel about this persons behaviour.
Call their intentions as they are coming across out in front of your other half.
Remember, no one has the right to make you feel uncomfortable in your relationship.
No one is allowed to play mind games and ruin your relationship with your other half.