My boy and I hardly spend time together because of his work. And when his off, he always spends time with his two kids. I don’t have a problem with that because I really like that. But is it fear for me because every time when he is free he is sick and I normally ask him if I can come to his house after work, as he's got a problem with his car. He will never reply to my sms and at night he will send me a sms asking me if I’m coming. And this person keep on telling me that he loves me. How can I explain to him that I am not happy at all? He is a very sensitive guy.

Unless you are honest, and GENTLE, he will never know that this isn't working for you. Honest communications doesn't have to be harsh, or confrontational.