Should I be worried??

My boyfriend and I have been together for almost a year. We met at work and started dating while we both worked there. I had worked there for about a year before he came back. He quit and got another job a few months ago but I still work there. Anyways besides the point. Since him and I worked together we have quite a few of the same friends. When I first started working there I had this girl that I was kind of friends with. We weren’t super close but we talked and laughed every now and again. She quit a few months after I started and her and I kind of fell off and don’t really talk anymore. When my boyfriend and I started dating he was texting her and she got really excited that we were together so I didn’t have anything to worry about. Then a few months ago I can’t remember if it was my boyfriend or one of our other friends but someone told me that the girl used to have a big crush on my boyfriend and made a move more than once and finally gave up after he kept turning her down. Again I didn’t worry or think too much of it because they kind of quit talking. My boyfriend and I were doing some grocery shopping one night a few months ago too and saw her and someone else and we stopped and talked with them for awhile and she wouldn’t talk to me or really look at me and when she would look at me she would give me the nastiest looks. Fast forward to a couple hours ago my boyfriend and I were sitting on the couch and we were watching Facebook videos together on his phone when the girl randomly just texted him “hi” I looked away and acted like I didn’t see it and he texted back a few minutes later and said “hey what’s up.” Then him and I got carried away watching tv but I felt his phone buzz and I looked and she texted him. Then I felt it buzz two more times and then he picked it up and it was her again. She texted him three times in a row and I couldn’t get a very good look at what she said but I saw something about her saying “ sorry I just wanted to try and catch up 🤣.” Then they just started casually texting but I couldn’t see what they were saying because of how my boyfriend was laying down. I am trying not to be too worried about it but she is really pretty and I know he turned her down in the past but I’m honestly not sure why he did. There might not even be a good reason for him turning her down other than he just didn’t want a relationship. So everyone should I be worried at all? Should I be worried about her making a move?