<human>: Can you provide a brief overview of the text?

Basically everything in my relationship is great. We get along well, have fun together, share friends, and love each other, but the feeling of wanting to be single is getting stronger and stronger for me. I've been trying to fight these feelings, because I don't want to hurt her and the rational part of me tells me I would be making a mistake. But the desire to be single only grows stronger. 

What should I do? Is it normal to feel this way? Should I keep fighting these feelings and hope they pass, or do I need to accept that I am falling out of love and end the relationship? 

Breaking up would be a huge shock for her. She would definitely not see it coming. If I break up, what is the nicest way to do it? 

These feelings have been driving me to a mild depression lately. I feel so conflicted, and even worse I feel like I have betrayed her just by having these thoughts. 

Has anyone else gone through something like this? Any suggestions?
<bot>: In a happy relationship. Love my girlfriend, but I deli like I'm not in love anymore and want to be single. Will these feelings pass, or should I end the relationship?