Why would women cry after making love and start missing the man like crazy and get very sad when he's busy working and can't see her?

It sounds as if she has insecurities that she must deal with professionally. Crying after sex can happen to some women, but missing this man even when he's working and carrying on as she is, is not normal. She should be relishing in the fact she will see him soon, not being miserable over it. Each couple should have a life of their own. She should be out working, out with friends, perhaps volunteering and have her own life as well. If she doesn't get some help for these insecurities then she may well lose this man due to suffocating him with her affections.