My boyfriend talking to other girls

My boyfriend is 24 and I am 34. When he first met me I was good friends with this girl. After she flirted with him and took his side during every argument we ended our friendship. My boyfriend still talks to her constantly and she sends him gifts she has a boyfriend and moved away but they are still very close friends and it makes me uncomfortable and it has for a long time and I’ve told him how I felt. one time when we had a fight she even threatened to take him away and still sends him gifts. The other girl is someone he works with who I walked in on once into the store and she was very close to him and they both acted very awkwardly as soon as they saw me. She also never likes when I talk when she’s talking to him she’s very weird around me. He also went ice skating with her when we were broken up. Yesterday I just glanced at his locked phone he’s very secretive about his phone yet looks through my stuff all the time getting jealous over little stuff yet he’s snap chatting with these girls all the time. I think it’s wrong and something is not right. Someone said if you have to ask then you should already know . I’m right to be upset correct ?