Why is he resisting his feelings towards me?

There is this guy...there is a small possibility that he likes me. he's all touchy feely we have slept together...not sex...literally slept together...in the same bed...cuddled up... and things...but its like he's trying really hard not to kiss me or anything...like he doesn't want to like me. It could be the age gap that gets to him...hes 28 and I'm 20. It doesn't bother me though. So why would a person resist feeling something for someone else?
Why is he resisting his feelings towards me?
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