Michael, Nina, Carly, Dex and now he finds out that Jason is alive, never told him or anyone else and is involved with a group trying to kill him and whether he shot Dante or not.....he was with the guy that did. In the mindset that he's in right now, not trusting Jason makes sense.
What bothers me is that when Sonny said he was with his son, she should understand that and leave it alone. She doesn't seem too worried about Dante now though. It's now all about Jason.
What can I say? Carly is not exactly known fir her sensitivity or subtlety.