No one is unlovable, and its ok to be or feel scared your human, you have to ask yourself if you are still willing to deal with his lack of motivation and his irritbity and how you felt he only wanted you for sex. Have you told him all of this? once it has been laid out on the table you also have to listen to his dislikes about you. How will you deal with that? Remember you shouldnt change someone or for someone, but you should try and understand each other and your differences. I cant tell you to get back with him my advice to you is we all go thru brake ups and it is hard we think its the end of the world and that noone else will want us. we feel lost, alone and confused, we ask ourselves what have I done what can I do to change it. That is all normal as long as you dont fall into a deep depression look for something that will keep you busy, read a book (no love stories) go jogging join a fitness club. If it was meant to be you both will know it.