How do I manage with my feelings of being jealous when I see my crush is spending time with his other girl friends?

It’s simple either ask him out or get over it.
If he ain’t your man he doesn’t know you like him then of course he’s going to be hitting on other people I mean it’s not like he’s gonna try to be alone for the rest of his life.
Now if for whatever reason, you decide you’re not gonna ask him out then the only reasonable thing to do is just move on. Detach yourself from the situation and find someone else. There’s not really a secret technique in doing so it’s basically just you’ll get over it. You just become emotionally numb to the situation and move on.
Perhaps it is time to jump the line and ask him out?
Then they can be the jealous ones. Nothing ever came of sitting on the sidelines?
A lot of that stuff has to do with making decisions and figuring out one's own aliances/aleigances/politics and policies.
There are people who prompt for attention by spending time with others.
Considering one can only really be with one person if one doesn't want to waste their time and money, I'd avoid such type.
(Could also say you were probably raised to be a sucker, but so was I)
forget him if he doesn’t love you
Why do you give a loser someone from your past your precious thoughts lol
Best revenge you can do is find another men way way better than him
Opinion
8Opinion
Whenever u get jealous just imagine your crush doesnot exist and ignore him like you never met him aur you haven't seen him before, start thinking about someone you feel something thats how you will over come this.
Really kind of makes you wonder why people think people can be "just friends" with others, right?
You dig a well hole and put his ass there. Give it food and body lotion.
Ask him out already. He's not yours, you shouldn't be getting so jealous over nothing.
So far you are not in relationship with him, so why you worried, he is your crush, you are not his crush 
Be authentic and let him go with others. If you want to manage your own company.
Does he even know you like him?
are you two together?
Stop chasing Chad Thundercock.
Jealous is a cancer
Superb Opinion