Why am I so damn emotional?

I cry for what seems evrything. I take evrything way too serious evn when I know I shouldnt. Ive accomplished so much lately with so little that I have but still feel like ive failed. I know im depressed. I have a child with my X and we have an intimate relationship but thats about it. I know he doesnt love me. Today is mothers day and he came to pick up my son so I can go to work n didnt even bother wishing me a happy mothers day. I cried all day. Im a very good mother.....id give n do anything for my son. I cant help feeling emotional like this....