<human>: I'm a 25 year old male, here's my story. 

My girlfriend and I have been dating for almost 3 years. We're both 25 and have been friends since we were 18, we made the decision to start dating a few years ago. It's been a good relationship together over the past few years, but every day over the past few months I feel more and more like were just best friends that have sex occasionally. We're both in college, we both work part time, and we live together. I've felt this way ever since she asked me about marriage, and I considered it. 

I love her, but I'm not in love with her. I know for a fact that I don't want to marry her but at the same time I know that she wants to marry me. We attended a friends wedding over New Years in which we were set up by the bride/groom to catch the bouquet/garter, and all of our friends won't stop talking about how we should get married. She's asked me a couple of times now what I think about marriage and all I can say is "I'm just not sure yet". I don't want to crush her dreams but at the same time I don't want to be miserable marrying someone I didn't want to for the rest of my life. 

I'm happy with our dating relationship, we're both faithful and caring. We're both good roommates, and we have similar interests; but I feel as though we're both at the stage in our lives where we should be looking for the person we want to spend the rest of our lives with. I'm worried that I'm wasting her time because I know I don't feel the same way she does. Is there any solution to this?

Any advice would be greatly appreciated reddit. Thank you.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: I don't know how to tell my best friend that I don't want to marry her, but I don't want to hurt her because the relationship isn't a bad one.