Guys, Does he like it when I kiss his neck/ear?

My boyfriend and I watch movies all the time and while cuddling sometimes i start kissing around his neck/ear. He starts to breath heavily and adjusting his pants and swallowing a lot. But he just stays quiet and sometimes lays back... he would never admit or tell me if he likes it or not so how can i tell that he likes it? Details please?
Guys, Does he like it when I kiss his neck/ear?
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