jealousy kills

I always wonder...
do i not give people any sense of security ?
do i really give the impression to people that i'm not serious ?

i don't know why. someone that liked me and i had a very good impression of that person ... we started talking to each other for some time and then started to tell that likes me ... everything went perfect. conversations and everything was perfect but not until one day, things that i really dislike started and never ends.

i don't understand -
-how can i go out with my friends for drinks it makes you jealous.
-how that it matters whether i go out in a group of friends or just 1 friend makes you jealous?
-how that i left my computer and msn on and felt asleep and couln't reply ur msg makes you upset
-how that i said i might not be going out but in the end i went out makes you jealous.
- and etc.

do i really give that impression that i'm not serious and making u feel insecure? it just made things from good turn to bad... everything was perfect like i said ... but u made things worse by controlling and getting jealous easily before things even get serious between us ...

it just makes me wonder ...
if things really worked out between us and we got together ... i couldn't imagine how the relationship will be like and how it will end up ...

in the end all i could say is *sigh*