Is he avoiding me due to sexual tension or is he just not into me?

Anonymous
There is a man whom I've known for a few months (we are both dating other people and this man is about 18 years older than me.) At some point I began to notice that he seemed to be flirting with me. He glanced at me often, smiled a lot, seemed to be shy and nervous around me (despite being very outgoing normally) and I caught him checking me out once. To test my theory I made eye contact with him, at first I could tell he was taken off guard but he quickly relaxed into the eye contact (did not break it) and had a huge grin on his face. His eyes were even shiny/sparkly as it went on. I became kind of shy after this exchange and the next few times he looked at me I looked away. I didn't see him for several days and now he seems to be avoiding me. For example he will stand far away from me if we are in a group, or will almost hide if we are in the same vicinity. Do you think he is avoiding me due to sexual tension (which is likely to remain unresolved as we are both dating other people) or was I mistaken and he was never interested to begin with. Unfortunately I can't get this man out of my head.
Is he avoiding me due to sexual tension or is he just not into me?
2 Opinion