This one is pretty self explanitory. You've been hurt, and it's hard to open up and love someone again because, well shit, are they going to pull the same things your ex did? The rational part of us tells us to run away, but when you're that attracted to someone, you can't help it. Maybe you'll be hurt again, but for the time being you don't care. You just go with it because of what you're feeling for that person.
This one is pretty self explanitory. You've been hurt, and it's hard to open up and love someone again because, well shit, are they going to pull the same things your ex did? The rational part of us tells us to run away, but when you're that attracted to someone, you can't help it. Maybe you'll be hurt again, but for the time being you don't care. You just go with it because of what you're feeling for that person.