Is there such a thing as being to forgiving?

So I applied for a job at Verizon Wireless and well I had my first interview Saturday morning and Wednesday I have my second interview. Sounds great where is the problem. the problem comes from asking for work off without lying. I was told to say I have a doctors appointment. I felt it was just best to be honest so I told them I have a job interview because I am not sure i want to stay and I can't know what is best for me if I don't look. I immediately got pulled in to the CEO's office to talk. I was told that my name came up for positions that are opening up and that if I go to this interview they can't consider me for those positions where the decision needs to be made in the next couple of days. I am thinking great I might actually grow with the company. I told them I still want to go to the interview because I need to make sure I am doing the right thing for me. I was told that I can try but eventually i would just come crawling back to Namifiers (maybe not in that many words) and that if I am a forgiving person I will choose to stay with the company. I was then given 2 hours to make that decision. That is a pretty big decision to be made and to be given that little amount of time makes it even harder, but if I am an honest forgiving person I will choose to stay. In the end I said I would stay. This means I forgive them but how many times is too many times in this case. This will be the third time I have forgiven them what if it happens again? They have lost my trust and it will be hard to get it back. I am willing to try but is there a point where I become to forgiving?