1. stop being possessive over what?? in a relationship or over friends???
2. sort it out before it ruins a good relationship.
3. any sense of Insecurity, unloving background or Psychological trauma?
4. either you don't respect/trust your partner or yourself?
5. Relationships are not meant to be co dependent, give the person his time and space, and if you are trying to control his life according to your preferences, than you are disrespecting that person, try to solve this internal issue (if present)
6. Consider a Psychiatric Counselling
to see whether you are actually ready for a relationship or not.