Is he sincere or not?

Lately a friend is offering to help me in something but I just keep get the feeling that he is not really sincere to help me. I think he want to help me because he can get something out of it. I don’t know why, I keep feeling it. And he is really started to annoy me. I’m keep thinking what’s in it for him. Why is he willing to help me? I don’t believe he help me because he want it to, just keep getting the feeling that he only used me. I can figure out what the purpose is but am I to suspicious?

I have many friends and often get help from them. A lot. My best friend even loan me money to pay my bond to my previous company and I don’t feel suspicious about it. But with him, I don’t know why I got suspicious. Am I too exaggerating? Or this is my conscious that telling me to be careful?

He often said that he did it to help me and it will help my future. I just want to say, let me worry about my future my self, I don’t need you to worry about it. I don’t think that he understand about me and my future. I can not say no to him because I think it will be impolite to reject such a lovely help. But I just can get rid of the feeling. Why? Am I to suspicious?