I wrote two answers. One for the weak hearts and one for the strong hearts.
For weak hearts:
Ultimately, if you want to stop being jealous of this individual, stop crossing paths. And try to get with someone else to take your mind off of him, so when you do see him or have an opportunity to get jealous, you won't care cuz the person you are with at the time is way better or you are trying to get to know them better so your EX will seem like a stranger to you.
Or, take up a hobby instead of dating if you find too many similarities in your new partner cuz it will make you think about him more.
Here's an alternative answer to your question for stronger people:
It depends, for instance, if you broke up with him - you are saying to him and yourself that you don't like him and that you don't want to see his face anymore cuz he disrespected you in some way or you just lost your attractivity to him - in this case, why are you still paying attention to him? and that's it on that.
If he broke up with you and you find yourself getting jealous because he talks to other girls, maybe he's ur EX cuz you were too clingy. What you need to do is check and take a long look at yourself and realize that you don't need to be attached to someone just so you can be social, get treated nice, have things bought for you, find romance or whatever it is you can do yourself. Become independent for a month - trust me, it helps. But whatever you do, don't let it get to you or become you because Loneliness is the number one cause of death. It's a fact.
But if that's not the case, then maybe you should try to prove to him that he should talk to you instead of these other girls (probably by becoming who he would be interested in again before you broke up - because guys rarely forget about the pros of each woman he dates - I mean, if he can't remember why he was with you in the first place, maybe you shouldn't be jealous at all) or stay out of his game cuz he doesn't care about you anymore and he doesn't want to make it work and you shouldn't care about him cuz he's stuck on something wrong about you that he can't tell you.
There is no reason why you should be jealous of your EX - just think about why you wanted to date him, you wanted to date him because you want someone who could keep you warm, to find all of your quirks cute and be your best friend, it's called dating, not marriage if it doesn't work out, you break up and move on.
Because he doesn't know who he's going to end up loving when he finally decides he wants to settle down, make sure that he's not looking for just a good time - if he is - you shouldn't be jealous, because you provide way more as a significant other than those females (or males) he's living fast with. And in the end, if you hold on and come back, you'll have the man you want. I mean If you really care about the preservation of your special relationship and feelings you only share(d) with him.
I hate when someone breaks up with me and doesn't tell me why - it's always a roundabout answer and it's never consistent. If he told you why, you should try to show him that you fixed the problem and he'll want to talk to you again like when you were together and then you'll have control over him again boyfriend or not and you can tell him to talk to you instead of other girls.
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