We say "acting suspicious" to describe someone's behavior or actions that seem questionable or cause concern. On the other hand, "looking suspicious" may refer to someone's appearance that suggests potential wrongdoing, but the more common phrase is "acting suspicious."
Well.....if he is acting suspicious or creepy that could be one sign. Another is probably is if he breaks away from you in an odd way. (WHO HAS THIS PROBLEM?!?!?!?)
He was acting that way to get the audience to like them.
If your neighbor is acting suspicious like something is up you should be worried!
Then be suspicious. He may have another girl friend.
(of a person or thing) Acting in a suspicious or conspicuous way.
tell him he is not your boyfriend and to back off.
very suspicious i'd say . i'd take it into my own hands apparantly he doesn't want you to know who he's talkin to .
If she is acting secretly and acting extra lovey dovey
The security guard followed the suspicious individual, acting as his pursuer.
if you start acting controlling
He can tell by the way you have been acting.