Give it some more time before you make a decision. I'm afraid that after ten years with Mr. Boring, he's gotten really unbearable, and he's only going to get worse. If a man's not exciting to you when you marry him, believe me, the excitement won't show up by magic. You've changed a lot and grown up since you met Mr. Boring and he may have been fun when you were 15, but today you've drifted apart. He wants to stay home, you want to go out.
Love is about more than loyalty, although loyalty and commitment are important.
Howard Hughes used to say he never made a decision until he absolutely had to. Perhaps you should try his advice in this situation. In any case though, it's been my experience that women who marry boring but safe men wind up bored and having affairs on the side. Besides, if you've been with a guy for 10 years and he's not talking about marriage, he may never bring up the subject. A guy who's been married isn't all bad.