Insecurities

This has been issues with me and my boyfriend relationship for almost 3 years. We're long distance partner and in that time we have never seen each other but we always plan it, not even video call. 2 weeks ago, we had huge fight because of me being insecure towards him help on of his friend, I promised him that I'll do better and I did slowly, until yesterday I saw him playing a game with a female friend. I noticed it that he been liking the girl's tweets so I was also liking the girl's tweets. He repeatedly said to me that he's just friends with everyone else, I trust him but it's really hard. I can't control the jealousy and my feelings of afraid losing him. I want him to talk to me only. I know he just helping people, I know it's a game, but my anger, my insecurities and my jealousy got better of me and ruin everything. We broke up before he fall asleep. He live in USA and I live in Asia. I know it's just an online interactions and he always say to me he only loves me, but I don't know why I keep getting jealous and insecure about it. Like... I didn't ask for this but I always worry and overthinking anytime I see him talking to a girl. What should I do. I love him dearly and I want this relationship to work, but this insecurities of mine ruin everything... Please, I need help. I don't want to lose him or hurt anyone because I'm being insecure.