If you read this entire thing thank you?

Yes it is normal to be more wary of investing your full emotions after having failed attempts at relationships. When the right girl comes along and you will know when she is right for you, you will feel those emotions again. Just dont protect yourself by being completely shut off. You will be hurting yourself worse in the long run. Relationships hurt sometimes, but its better than being unable to feel. Women do this too. It is a way of saving our self humiliation, hurt and disappointment.