Why do I feel like a magnet for the married and taken?

Seriously it makes me not to even want to try to be in a relationship when I am surrounded by people who have the will to cheat like its no big deal. Not to mention the 2 traumatic relationships I have been in in the past 7 years. I have little faith in loyal relationships but I get lonely sometimes but I just have really deep trust issues so i feel like i can't do it. Its really pissing me off.