A thing for my earlier transition trans pals - I've discovered friends who are only connected by transitioning at the same time as you are kinda like "summer camp friends" or "work friends" You bond over that specific shared experience, but once that becomes a smaller part of your life you don't really have anything connecting you anymore. So the friendship fizzles unless you'd made more connections with one another outside of "we're transing at the same time".
Not to say don't have trans friends you can make it through that time in your life together, but if you ACTUALLY want to stay long term friends, make additional bonds beyond trans bullshit.