My gf maybe texting another guy on social media

I'm (22)m and she's (21)f. We met on a dating app called hinge a couple months ago, we started seeing each other and dating. Not too long ago, i met her family too. So recently i haven't been really hearing from her alot like i usually do, she text me good morning and things and she haven't really been texting or calling me. When we do talk she always text with one word like just ok or yeah. Last night she put on her Snapchat that she likes chubby guys and where he at (im kinda chubby) i replied " you calling me chubby lol and she said " no im not, im talking about something else. I haven't heard from her since. Today she posted a conversation she had with a guy on ig and the censored most of the text and i seen where he called her sweetie and she said she'll think about it. I replied to her and said everything ok? She said yes she just checking her ig because she haven't use it in a long time, she later remove the post. I asked her who was the guy that she was talking to, she told me some guy that been trying to talk to her for a while, she keeps blocking him but he keep making accounts. What do you guys think? Sorry about my grammar