Am I in high school again?

When I was in high school I was never sure who was telling the truth or who my real friends were. Once I graduated and figured out who I was I felt like I had developed "true" friendships. And although my cell phone didn't ring off the hook every hour and I didn't have plans every Friday night, I felt like I had a pretty decent social life.

When I met Duane my friendships changed again (although some remained constant). We spent more time with family and friends who were also "couples". When we got married and had Devon we spent more time with other couples who also had children. I had 3 or 4 close friends and several other friends who I spend some time with but never confided in.

Recently some people in my life have let me down considerably...I feel like I felt in high school. So unsure about who is my true friend and who is only out to better their lives. I feel like I have invested a considerable amount of time, energy, emotional energy in these relationships only to be completely unappreciated. I have tried to be a good person and have done as much as I could to nurture these friendships and relationships but am now realizing maybe I was being taken advantage of...and the real shame...these people are not only supposed to be my friends but are also members of my own family! So I am stuck between a rock and a hard place.

I am admit my disappointment and disgust than I will be causing family turmoil. But I feel at this point if I let them continue disappointing me that I will eventually not be able to forgive them and have to make a major choice...To keep loving a family that lets me down so consistently or keep myself at a safe distance?

I would like to say that I will get over the most recent issue, but feel that this may have been the last straw for me and I don't know if things can ever go back to the way it used to be. It makes me sad, sadder than anyone could ever imagine because it has taken many years to even consider one of the people in the equation a friend. One of the other's involved didn't take me quite as much by surprise as we never were able to see eye to eye and the newest member of the family I am devastated about as I had begun to think of them as one of my very closest friends.

I don't want to get into details but I will say there were 2 separate incidences over the past week that have led me to this post and have led me to re-evaluate my friendships. Who are my real friends and who are my friends because it is convenient to them??? A question that I thought that I had answered when I graduated high school.