Yes, the sentence is grammatically correct. It conveys a sense of seeking advice on how to deal with a man who is both insecure and overly fixated, likely in a romantic or intense relational context.
Possible rephrasing could include:
- "How can I manage my relationship with a man who is insecure and overly obsessed?"
- "What strategies can I use to handle a man who is insecure and excessively fixated on me?"
- "How do I deal with a man who is