<human>: Provide a brief overview of the text.

Hi everyone,

So i've been with my partner for two years. Yes, we are young but this is the longest relationship for both of us. He is wonderful- kind, generous, funny, hard working and caring. I honestly 4 months ago was commited to marrying this person. However in the past few months I've been second guessing things. I find myself taking extra shifts at work, not to avoid neccesarily but I don't have that dying urge to run and see him when I get off work and I would rather make a little extra money. We haven't had sex in a while because I had a medical issue and now that its gone, I don't feel in the mood AT ALL. I'm totally disinterested in sex.

However, he is completely head over heels in love. He's talking about trips we will take together and when we will move in together and all this other stuff thats making me panic a little bit.

I feel like a horrible person because he's such a wonderful person and I can't even put my finger on what is wrong with me. I'm not even interested in anyone else and I know if we did break up I wouldn't date anyone any times soon.

I'm wondering If I should volcalize this to him at all? Tell him I'm second guessing? Tell him I need space? I really don't even know where I would start with it. I just don't want him to be completely blindsided if I do decide that it is time for us to move on because as of this moment, he has no idea.
<bot>: Having second guesses about partner, wondering if I should vocalize feelings so a breakup isn't so out of the blue.