First of, I'd like to apologise that this has happened to you. It is a shame that you invested time in a person whom clearly did not value you in the same way in which you valued them. It is highly unfortunate, but things of this nature occur frequently and we can only learn from them. Luckily, you have become aware of what is going on and are now able to extract yourself from the situation. Although this may be problematic, it is what is best. You do not want to put so much of yourself out on the line for another person and end up feeling unvalued and unappreciated. You are worth more than that, I assure you. However, it may be worthwhile to see what the persons (eventual) response is when you next see them, perhaps she has genuine reasoning behind her lack of response that you aren't aware of. Social media can often cause more problems than it solves, after all. In light of your negative experiences, i hope that you do not allow yourself, as you stated to become 'distrusting' of others, or more particularly 'any girl'. This form of treatment happens between both sexes, unfortunately we're all capable of being ass-holes. Don't let this put you of any girl in the future. Start new friendships/relationships with a positive light, but be mindful of those who you trust. Of course, this is difficult, but it is something we should perhaps bare in mind. Sorry for the length of the response, and again I am sorry this happened to you (it has also happened to me a few times). Stay positive, stay happy. Keep negative energy away.