what things are considered as betrayal in a realtion?

From a general standpoint, betrayal is defined as being “unfaithful or disloyal”, “revealing something that was intended to be hidden” or to “seduce and desert” (Steinmetz). From the standpoint of close relationships, betrayal may be defined as an individual act, or a continuum of acts. Doctors Finkel et al therefore explain betrayal as a “percieved violation by a partner of an implicit or explicit relationship-relevant norm. Betrayal may be said to have occurred when the victim believes that the perpetrator has knowingly departed from the norms that are assumed to govern their relationship, thereby causing harm to the victim.”

Quite a mouthful, isn’t it?

Actually, it’s the mumbo-jumbo of psychology which we can probably break down into clearer components.

when someone started to cheat and deny the fact and also when you caught him/her in the act they insist they are not doing it they are tempted

I dont like the people who turns their backs on me. The thng I consider to be betrayal is being dishonest to me.

Lack of openness and transparency in close relationships, desire to subjugate another person to one's own will for the sake of self interest, unwillingness to take anotehr person's point of view are inclusive in this though this may not strictly fall into the category of betrayal. These are some things that may lead to a betrayal.

Making a commitment and then backing out with be betrayal to me.
Showing dreams and then turning his back would be betrayal to me.
Being in a relationship with someone else and also saying he loves me would be betrayal to me.
Telling me lies would be betrayal to me.
Flirting with girls around him or on phone on online while telling me that he is loyal to me would be betrayal to me.

Lying, cheating, breaking the trust...all this show that the person doesn't have respect for the relationship. If caught once, I would try to convince him to tell the truth and do what it takes to revive the relationship. But if he fails I would never like to give him any more chances. Betrayal could be due to circumstances if its for the first time but when its more than that its cheating outright. And a complete NO for me.

Thanks.

hi dear according to me betrayal would be breaking trust and lying i am a very honest and straight forward person for me life is very simple and i like it this way...i would never ever make false promises ever to anyone..have a nice day

Hi.
I have never went through something like this personally but I guess betrayal in a relation means sharing something with someone other then your partner, which your partner feels should only be between the two of you. It may be of physical kind, emotional or any thing else.

Hi sang2k2! I have experienced being betrayed by a friend and I was deeply hurt by her actions. she befriended me and earned my trust. I thought she was all so good and found out later that she is one friend who can be so good and kind when you are with her but when your back is turned, she will be concocting stories and lies about you. It was really sad and when I found out her true colors, I have avoided her since then.
Take care always..God Bless!

All the things mentioned by you come under the definition of betrayal. Basically, playing with someone's emotions and doing exactly opposite, what was actually promised and breaching someone's trust may be termed as betrayal.
(It appears to me from your current discussions that you had had a very bitter and unpleasant experience in a relationship..............I would say, please do not be too serious, this happens with many.........try forgetting about bitter things.........remember.......it gave you a kind of experience, which you can utilise to shape up your future life/plans)
Life means moving ahead.......without cribbing about the past..........and .......learning from our past experiences........
All the best to you!!