There have to be very strong reasons for a guy to lose interest in you all of a sudden. So you have to investigate the possible causes, that have made him lose interest in you and wants you out of his life or wants to leave you.

You have lost that sense of mystery
Have you failed to hold that same enigma for him that he knew of you when he first met you? Or have you lost that sense of mystery that shrouded you earlier when he first met you? You will then see that his interest has begun to wane all of a sudden.

Are you too condescending?
Has he seen that streak of condescendence in you with regard to anything that he says or does? Do you quietly accept whatever he tells you to do and or the way he tells you to do it? Do you never say ‘no’ to anything he says?

How confident are you of yourself
Do you exude that air of confidence about yourself or do you display timidity and lack of confidence about yourself and in the things you do? If he sees that you lack confidence and cannot handle things on your own then he will lose interest in you.

Have you changed from what you were earlier?
Have you over the period changed in your ways and behavior? Are you not the same person that your man used to know when he first knew you? The girl he first knew is no longer the same girl with whom he had fallen in love. That is the reason for his losing interest in you.

Do you constantly remind him of commitments?
Have you begun to remind him of the commitments he once happened to make to you? Possibly he is unable to cope with all of them on time and feels guilty about it, while you continue to give him reminders about them. He naturally would lose interest.

Is he feeling deprived of his space?
Are you hovering around him a bit too much? May be he is feeling suffocated with this attitude of yours where he feels he is not left with space of his own. May be he resents this and has begun to lose interest in you and shows it clearly.

Are you being very authoritative?
Do you always exercise too much authority over him and things around? Do you always take the decisions and see that he abides by them? He never seems to be able to get you to accept his opinion or suggestions. You have contributed to his losing interest in you.