For the above, i agreed on number 2,3,4.
As for no 1, i can say yes and oso no.
yes becuz he felt the change in u and is fearful of losing u.
no becuz i scared instead of getting jealous(its an ego thing for
guys), he might feel threatened and used it as a weapon in future
when problems arises in ur r/s.(but tat doesn't mean he loves u
lesser, mayb he is a MCP.)
3) slight change in ur behaviour as in not sharing too much of ur
encounter with him might leads him into thinking tat y now u dun
express urself as much as b4. But sometimes, guys r not tat
sensitive enuff to realise ur change.
4)Sharing the same interest and hobby can be so fun and brings ur
r/s to a higher lvl tat u will nv imagine. Even thou u might be of
no interest or find them boring, y not give it a try? It doesn't
hurt to learn new things rite? But its painful to let ur r/s fade
off juz lidat.

Sometimes guys juz tend to forget to tell their gfs abt some things
tat had happened, juz take it as he had 4gotten to tell u. u have
to think +vely.