Signs he is fond of you?

So I spend a lot of time with a guy because and I've come to grow fondly of him... I feel comfortable in the silent moments but I dont think he likes me, i mean, he is nice to me and everything but, how can I know if he is at least a bit fond of me. He is my foreign languages teacher and we are almost the same age (both out of university). Im pretty sure he doesn't like me in a sexual way. I just feel very comfortable around him. How can I know if he thinks kindly or fondly of me?
Signs he is fond of you?
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