<human>: Could you distill the essence of the text into 1-3 sentences?

I've been dating a guy casually for about 4 months. He's already told me how he isn't ready for a relationship. I like him a lot & don't have much else going on, so I told him how I'd stick around because I enjoy what we have. I also told him how I'm okay with him seeing other people. 

Truth is, I'm not. I just don't want him to feel latched to me or anything... Yet I have this irrational fear that I may lose him to someone else.

How can I become comfortable with the guy I like & am seeing, seeing other people? Did I fuck up telling him I'm comfortable with him seeing other people when I'm not? Do I have proof he is dating others at the same time as me right now? No, but it's possible... (No, I don't want to date others myself... I know that may be a solution, but I'm not up for it right now.)

I have no doubts he likes me a lot, but I'm so uncomfortable sharing...
<bot>: Guy I'm seeing is seeing other people & I don't know how to be comfortable with the idea of him seeing others.