<human>: Summarize the given text in a few sentences.

My boyfriend is lovely, he cares deeply for me and has made several significant changes to keep me around.

We have had some significant troubles in the past mostly related to drinking and hobbies, but we worked them out and both of us were happy with the changes.

Following this, our relationship is very calm and comfortable and loving. We communicate well and he is extremely kind and supportive and patient with me.
My problem now, is that I feel so unfulfilled sometimes and I'm usually so outgoing and liberated, but I feel like his very calm and mature personality keeps my silliness and tenacity from reaching normal levels.

We have discussed about how I'm not really happy and tried to implement changes, but I just don't feel like it's working. When I told him a few months ago about my unhappiness and what I feel the reasons for it were, we had a really great talk and I felt so close and connected to him and couldn't believe I was considering not being with him. But now that feeling is gone and I don't know what to do. I feel like I'm not being fair to him. This was only a few weeks ago. So my question is...
<bot>: how do I tell someone I love them very much and they did a great job supporting me and working with me to make our relationship work, but I just don't think we're right for each other?