Not knowing whether I should be angry.

For a couple of days, I've been contemplating whether I should be mad at a friend of mine. Who pretty much cheated on his girlfriend, who lied to be from the beginning of what he really wanted. He purposely dragged things too long when it should have been over in a week or two, not a month. He pretty much lie to me about not able to come to my dinner, saying his friend was depress over a stupid break up. But he really wanted to be with that person. As you can see I really want to say the negative thing but I rather not. He lied when he said he wasn't interested in dating her, he was just attracted by her ditzy personality. The truth is he did want to approach her from day 1. What a idiot for me to believe everything he told me. I seriously made myself look like an ass, trying to help him, get out of the trivial situation. Why do people take advantage of me like this. I give them my heart and they throw it back to me with missing pieces.

I still cannot come up with a conclusion.