So stop trying to be petty and ruin something that obviously means a lot to her. Grow up, and realize that in life there are time restraints and you can miss opportunities, but learn from them! Don’t try and go sabotage things.
Also, if you really care about this girl (which you probably don’t) but if you do! You should want her to be happy. You should let her go because you can see in her smile and in her eyes that this guy makes her happy, and maybe even happier than you did.
I know it’s hard to let go of your pride, especially because for some reason some guys like to think of girls as competition. But just do it… Stop trying to cause beef with a guy who is only making her happy.
Stop being jealous of someone treating her better than you did. You had the opportunity and you lost it.
But most of all, leave her alone. She doesn’t want to talk to you, she doesn’t want to get your stupid texts because she already knows the game you are trying to play.