<human>: Can you give me the gist of the text in a nutshell?

I will try my best to keep this simple. I have a feeling that I won't get many responses that I haven't already spent time thinking about, but I'm feeling a little desperate. 

The short of things is, my relationships all seem to have a specific expiration date. I've been in a number of long term relationships. I am specifically interested in people who are intelligent and able to hold a good conversation or debate. Things always start off well. I find the newness exhilarating. I always seem to date people with unique hobbies or interests that I am excited to learn about. Yet, it never fails to occur that this doesn't last. I grow increasingly bored and restless and I crave an escape. 

I've been proposed to more than once. Yet, I've never been married and I've artfully ended every relationship I've had after about two years. I'm very diplomatic and have genuinely remained friends with ALL of my exes. 

My parents have been married for thirty years and model a beautiful relationship. I truly don't understand why I find myself here. I guess it should also be noted that I change jobs and move frequently (average of every 3 years). 

The biggest problem now is that I really adore my boyfriend. He is a family friend for many years and I have desired him for a long time. When we began a relationship, I was thrilled. My mom warned me not to hurt him. I love him so much. He is a good person and does not deserve to be hurt by me. Yet, here we are approaching two years and I feel the burning itch of restlessness. I don't know what to do Reddit. Help me. I already notice that I'm unintentionally rehearsing "the speech" in my head but I just want to make this work! 

We want the same things in life, we get along so well. I know I won't find someone I am more compatible with or who treats me better. I don't know what's missing to make that spark return.
<bot>: I grow bored with relationships after several years. Do I live a boring but stable life or risk alienating the people I love because I crave the thrill of change?