My (M20) gf (F19) is giving me difficult time when I work as a coach

My (M20) gf (F19) and I have been together for 2 years. Recently I was hired as a coach. I worked for my former high school, and I train the jv girls. This is my first year of coach. My gf isn’t very supportive with me. She gives a difficult time, and thinks I’ll be trying to get with one of my students. They are around ages of 14-16 years old.

Recently the season wasn’t well, we kept losing and last night we finally won. And it was our last home game. Since it being our last home game of the season and my students wanted to take photos. So they can remember this day. All of the photos we took, I was included in only one of them. However none of them show me touching them or putting my arm around them. Just posing with a W sign. My gf saw the photo on Instagram cause she wants to always keep in eye on me . And started to say that it’s unfair and that she’s going to go to parties and find guys to take photos with and then she went off on calling me the P- word. She started to say, that she deserves a better man and that someone that cares.

I told her that I wasn’t anything wrong and the proof was in photo. She told me she’s going to throw my clothes in the Trash, the clothes I still wear. I got constant threats from her and it was first thing in the morning. She even tells me that I’m for the streets, cause I coach girls, even if I get into the bus with both varsity and jv, she’s going to say things to me.

The worse part is that she doesn’t realize that they’re kids and it’s my job. Yet she went to prom without me cause “you can’t take bf” and she went to a party bus with guys and took photos with them too when they are the same age.

I don’t even go out, just stay home and focus on my career.