What would you do about a friend who gets in a relationship and suddenly stops talking to you?

I have a friend who every time he gets into a relationship he just stops talking to me. I try initiate conversations and while I do get replies it's always very short and one sided. I know at one point I've brought it up he said his girlfriend at the time didn't like us talking. Understandable. I'm not trying to cause mistrust. But now he's with a girl who he's known since middle school, who knows me, has had chats with me and asked me for advice before so I feel like the excuse isn't the same. Im trying to just give him space and let him enjoy the relationship but a part of me feels empty not keeping in touch.

What would you do about a friend who gets in a relationship and suddenly stops talking to you?
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