Pt 2 of First time throuple, how to deal with these feelings of jealousy and insecurity?

I know it’s stupid but I don’t want them to be around each other without me. It makes me feel like I’m the 2nd person. Living in a different place doesn’t help. If we keep on, he’s going to see her more often than I see her and they’re already way closer. I want to be close to her too but there’s the language thing and the fact that our schedules don’t mix well. I’m only here 2 or 3 days a week, once a week or every 2 weeks. He said he understands that I need to take things slow but it’s hard for me to do that when I’m worried about them being together without me. He doesn’t want to take it slow. He’s going into this so fast, I mean it is what he wanted. I feel like I need to speed it up because he is jumping in emotionally. He likes her a lot and she likes him. He said that she said she likes me too but her and I just don’t converse as much as them because the language. Right now it’s a mess. I don't know what to do. He says I attacked him with something I was asking about and made him feel like he’s cheating on me. I tried so hard to talk to him calmly and rationally but he still got so mad. He felt the way he felt and responded very emotionally and defensively.

Pt 2 of First time throuple, how to deal with these feelings of jealousy and insecurity?
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