Should I just leave it alone?

Okay back story, me and the guy she’s with now had a thing off and on for awhileeee. We never actually dated, it never was anything serious. We slept together ONCE and I instantly regretted it and don’t even like talking about it (it was that bad). The last time we started talking was shortly before him and this girl got together. To clarify I randomly quit talking to him. He wanted to be with me but I just didn’t like him like I did before, I have a son and I just changed a lot since the last time we had a thing and he just wasn’t what I wanted or needed ya know?

Okay well a few days ago I was at Walmart with my two year old, I was looking down in the buggy paying attention to him while I pushed the buggy, then when I looked up i just so happened to see her boyfriend, the guy I hooked up with. Well I squinted my eyes because I wasn’t wearing my glasses or contacts and I cannot see worth a crap and as soon as I realized it was him I was like “Oh shit” and looked away because I didn’t want him to see me or recognize me at all. So I walked on by them minding my business. Shortly after I get a friend request from her and then she canceled it. Well today I seen this (my friend screenshot and sent it to me.)

She’s literally talking about not being in drama but caused drama. I looked at him for .5 seconds and she’s acting like I was following them around being a creeper. Should I just block them all or will that make me seem scared for being “called out “ or something? I just think it’s funny because I could literally care less about him, sounds terrible but he was my “rebound” that I would go to every time me and my ex would break up and he knew it. I didn’t have strong feelings for him or anything, he was just fun to talk and flirt with. She acts like I was in love or obsessed. I mean she sounds insecure and this just bothers me because I don’t like people thinking badly of me, or being in drama that shouldn’t even be happening.

Also sorry girls, I just needed to vent and my best friend is at work right now, so I can’t talk to her about it.