<human>: Can you provide a brief rundown of the text in within 3 sentences?

We've been together since I was 14 and he was 12. He's the only guy I've been with and I just can't feel the same way I felt before. I love him, but I'm afraid I'm not in love with him. He's a great guy and will do anything for me, and he's the one I truly want to be with forever, however, I'm not sure if I need space, if I just don't love him anymore, or if I need to get experimenting with others out of my system before 'settling'. 

I used to be kind, and understanding. After he left me for someone else (about 3.5 years ago) and came back a year later (I took him back immediately), it's like a switch flipped and I became frustrated, my patience was thinned, and I wasn't as warm as I used to be.

I just desperately want to feel the same way I felt before, butterflies and all, I just don't know what to do...
<bot>: bf and I have been together forever. I love him but I don't feel in love with him and I wish I could.