If he really is gay and only interested in
This sign by itself doesn't mean he's gay, but coupled with some of the other signs, it can be telling. Men who live in Western countries, like those of North America and Europe, usually won't make prolonged eye contact with other men, unless they're about to fight or about to get it on or both.
This is a great sign that he sees the two of you as an item.
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I was also in a four-year relationship, so was being unfaithful too. I have a good female friend whose then-boyfriend would walk into the kitchen like he was trying to pick me up - sometimes in just his boxers. However, before you do anything drastic, you may want to look at things a bit differently.