He's Too Busy for You
One way to tell if you are driving a man away is to consider the balance in your relationship.
If you do all the calling, inviting and initiating contact and he is constantly telling you he is too busy to spend time with you, chances are that he's losing interest. The effort to spend time together should be even. If he is always too busy to take your calls, initiate phone calls or meet you, then it may be time to step back and reevaluate.
He Loses Interest in Sex
Another thing to look at when trying to decide if you are driving away a man is his interest in sex.
If he has never wanted or initiated an intimate relationship, or what was once an intimate relationship has turned platonic, it's possible he is losing interest. Also, if a man consistently says that he only wants a platonic relationship, take his words at face value. If, however, he says he only wants to be friends, but avoids you or doesn't make an effort to spend time with you, you may be driving him away.
His Plans Don't Include You
If a man is interested in you, he will make an effort to include you in his plans.
If he is always out with the guys, doesn't invite you to his family functions or is always canceling plans with you to do something else, it may be a sign that you are driving him away. Another sign is if you try to include him in your plans and he makes excuses not to join you. A healthy relationship is balanced, with both parties integrating their partner into their social and family lives.
He Downshifts the Relationship
If a man who you consider your significant other starts referring to you as a friend, or talking about wanting your relationship to be 'just friends,' there is a chance you are driving him away.
Healthy relationships move forward, not backward, in intimacy. If your guy stops wanting to spend time alone with you, starts treating you like one of the boys or withdraws from an intimate to a platonic relationship, it's time to take a look at what is really going on.