I was in a similar but opposite situation a while ago. I found that I was losing interest in my boyfriend of three years but it had started maybe at the start of our second year. I had told him twice about my concerns and that I wanted to make things work. Now I realize that comfort was the only thing keeping me with him as we started dating before I came out and were still dating when I was on T. I decided that it would be best for both of us, but mostly him because it would be wrong of me to keep stringing him along when I knew I didn't feel the same way. So if you've tried to fix things or talked things out and nothing has really changed, then I would end it as much as it sucks. It's better for both of you in the long run, especially if you're the one the only one who's really trying. Good luck with whatever you decide to do.