<human>: Can you condense the text into a few key points?

My boyfriend (m23) and I (f22) have been together for almost 5 years. Around the 1 year mark, I told him I loved him which he never said back. I was quite hurt and since then have probably mentioned it around 3 more times (with no response back).

I began to feel distant from him as he is not very open emotionally and shut myself off, so I lost feelings for him. He said he loved me the other day over text and I felt nothing. I feel like he has a "shell" and he is not able to love me wholeheartedly.

I'm not satisfied in the relationship and have not been for a while. The problem is, I am afraid to let go. I'm scared he will become this amazing person full of hobbies (doesn't do much now or interact) and I'll regret letting him go but at the same time I can't wait forever for him to become more "fun."

I can't imagine myself with anyone else. It's just a sucky situation to be in and I'm just not happy. I guess I don't really know what my question is. I know people will tell me to let go if I feel this way but I was hoping to get some insight from people who have been in a similar situation.
<bot>: I'm not happy in my relationship anymore and there's nothing he can say or do to fix it. Scared to let go.