My girlfriend has a male friend she always confides in. I do not feel like she should discuss some of our personal issues with him.
I can understand that. It took me many years before I learned to have complete faith in my wife.
That is good any advice for a young man and his relationship?
The only thing I can tell you is to have faith in her judgement. If you ever lose it, it is time to cut your losses and run because it will only lead to hurt and ruin.
That is great advice I truly appreciate it. I love her to death and we recently had our first child together. 
Love her while you can and enjoy your life together. Children grow up fast, i have two, a six year old girl and a nine year old boy. They are handfuls