Why do they ignore me

"then most of the times they speak and i jsut keep mum." - If you're not talking to them they probably think you're not interested which is why they don't invite you along.

Ditch em. obviously they dont want to hang out with you, so you shouldnt need to hang out with them.

It is a good idea to participate in the conversation, but talk about what interests them. Ask questions others enjoy answering. Be careful about introducing new topics into the conversation. Do not be controversial. It is particularly important that you do not express hostility for any person or group of people. In private conversations keep in mind that anything you say to anyone may be said to anyone or everyone else. That is particularly true in discussing anyone above you in the job hierarchy. Someone might pretend to be sympathetic to your hostility toward your boss, and then use what you say against you.

if you want people to love you, love them first. i dont know, but it's something like that.
you should start the first move, show that you're interested and START TALKING and invite them first to party or anything.

change it up. you ask them what they're doing, ask them if they want to hang out. you'll find it to be self-rewarding

Oh friend you have to socialize!Maybe you feel like this cause you miss your other friends now.But you can always make new friends lol.Please socialize and invite your other friends too.O.K.?

Why don't you start asking them what they're interested in. Then you invite them somewhere.

maybe they don't want you taking everybodys attention and/or are sexually threatened and afraid and jealous of you.

Are you their boss?

who cares? its just people you work with I dont talk to people I work with much either. I really dont care about whats going on in their lives and I suspect that they dont care whats going on in mine either.

Everybody is working for the weekends anyway. You know the time when are you arent at work.

that just means they aren't your BEST FRIENDS...
not all friends are BEST FRIENDS...

They don't like you. Get a life and make new friends.

Maybe they just be polite with you to not be embarrased.

Invite them over for dinner. If they come over you'll get to make friends with them if they refuse then you'll know the reason is because they are UNFRIENDLY.

i think its normal to feel bad becuase you were left out but don't be a baby about it. at work you should be really focused on working anyhow and personal relationships there cause lots of drama and problems. its better to get hobbies and focus on your real life. count yourself lucky you have a job but jobs come and go.

what does " just keep mum" mean? i have never heard this phrase.
my advice: try engaging them in conversation, or join in in their conversation. it could be that before when your good friends were still there, u ignored them to talk to your friends, so they have not had a chance to feel close to you. make an effort from now on if you really desire their friendship.

I guess you must not want to get any closer to these people but it must be awkward when they tmake weekend plans & you are odd man out. You have to decide what you want - and if it is to be part of their group - then speak up. Otherwise I'd consider new lunch buddies.

Well, you've already said when they talk to you, you don't speak back. So what would be the point of them inviting you anywhere if you're unresponsive when they try to start a conversation with you?

Maybe you shouldn't "just keep mum" next time and you'd have friends stupid.

start throwing sick parties and dont invite their inconsiderate asses!!! they'll come around!!

i feel the same way when im in a group of people all standing around me

change attitude, show some interest on your friends, well i think it will help, though i think you should not patronize how you behave

Are you in the south? I've noticed that the "southern hospitality" just a myth.