Girlfriend will not let me be a part of events with her kid?

My girlfriend and I have lived together for two years. I have two kids from another relationship. She has one. Her ex is always a jerk if I am ever around and he makes comments to me. For that reason, she made a decision months ago that I’m not gonna be around for anything that has to do with her kid that he’s going to be there. I’ve let it ride for a little bit. We just had a conversation and We are now Having a major disagreement. I am contemplating ending the relationship. We are a family and if he’s uncomfortable, it is his choice to choose to attend events or not. He should not be dictating my involvement at this point. I did not go to any of her daughter’s games during the season because “I was not allowed” by my girlfriend. They just had a local competition which I was not allowed to go and they scored first place in their division. They are now moving onto a regional competition. They will be traveling out of state and now I am again told I am not “allowed “to go. I went last year and he said some words to me in the parking lot and out of respect for everybody there I chose to walk away. I told her because she left me out of other events, I’m not willing to let her keep going to exclude me out of things in life. The kid lives here and I should be just part of some of the stuff that goes on. I’m not asking to take the place of the father. It’s a good way to bond and have the relationship. Other issues that I mentioned are, if there was to be an exchange of the kid, I would have to be dropped off home before she would meet him for the exchange. She had a birthday party for her daughter. I could not be there when the ex came to get the kid. I told her I’m not living my life tiptoeing around what I can and cannot be a part of and when that can happen. Just curious, everyone’s thoughts. Thanks

Girlfriend will not let me be a part of events with her kid?
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