I don’t understand why he got so emotional on our last meeting and told me he cares and then one week later act totally cold again.

If he has developed any feelings for you, it’s likely he’s hot/cold because of cognitive dissonance… he’s at war with himself. Part of him likes you and wants to see where things can go and another part… the part that doesn’t want to get hurt again… makes his defense mechanism kick in and he starts talking himself out of wanting to be with someone again. That’s why he can be hot/cold (especially in a week’s time because he’s had all that time for negative thoughts) and why people with those fears really do need to move at a snails pace with someone who understands that… because it takes a while to build trust that that person isn’t going to hurt them. Meanwhile, if you date someone like this, you run the risk of the defense mechanism winning, the relationship doesn’t go anywhere, and then you feel like you were led on again.