To stop the snide comments

[Layza101]

I absolutely know I'm totally out of order here; however I'm looking for anyone who has or is in a similar situation and how they got through it.
Basically me and exp split just over a year ago, for most of that year he had me on a string, so he was talking to people, going on dates and then coming to me for the sex part, which I'm as much to blame as him, but being in love with him, I would have literally said yes to anything.
Anyway, about 4 months ago he was talking about possibly getting back together, he was also talking to someone, so again as I was in love and we have a family together I desperately wanted it to work. It never even got to that and he is with this girl now and have been dating for about 4 to 5 months.
He takes our 2 boys on days out with her and her kids and takes them to her house for tea and stuff.
When I don't see him I'm absolutely fine, but when I do see him, I always make snide comments about him or his gf and how he treated me over our 15 years together. I feel good after it, but then feel shit and embarrassed that he's probably laughing at me as I'm not over it yet. He has also started picking the boys up and parking down the street, as she is in the van, but he says to me 'I'm doing it out of respect ' so then i nosey out the window to catch a glimpse.
I want to desperately move on, but how do I stop the comments, any tips at all as it's driving me insane that I care so much and i cry near enough every day, especially that our kids are doing the things that we used to do as a family.
Reading this back I'm so pathetic

You're not 'in love.' Stop telling yourself that. He sounds like a habit. And a prick. Pick your self esteem up off the floor. Start telling yourself that you deserve more than this git.

Have someone else do the hand overs until you get better control of yourself.

15 years is a good long time to be with someone. Your feelings will not just instantly switch off when you have invested your time and love into a relationship for so long. Only time will heal in this instance.
He has really done a number on your self esteem and made your self worth plummet. That is why you feel the need to do the ‘pick me’ dance and make snide comments. The best thing you can do is move on... with your life and with another man who actually cares about you! This guy left you after 15 years and 2 kids, presumably to shag about and generally boost his own ego. He then strung you along on the side, dangling the carrot of...we might get back together. He is fundamentally an asshole!
The best way forward now is no contact except with regards to arrangements about children. Go out and meet some lovely eligible men and have your own fun! Focus on your self esteem and self worth. Show him what he’s lost out on when you move forward with a happier more fulfilling life. Stop the bitter resentment towards him and his new GF. Put on a good show of not caring if you must, but stick to the no contact unless necessary plan!

Thank you for answering me, it has helped alot.
I know I'd never get back with him, I think I'm grieving the life we had and still should of had.
I would like to meet someone, but I haven't been on a date since we split so it's daunting.
I just finished a night shift and he forgot some of the kids things so had to come round to get them, and I managed to keep my mouth shut. I had loads of things going round in my head to say, but stopped myself as it's not worth it.
As Yazz says, The only way is up

I was the same after my split really had to bite my tongue not always successfully. My kids were all adults so easier for me not to see him or have any contact. I had to delete he’s phone number or I would have texted him and called him a cunt everyday.
Try to avoid any contact or interaction with him stick to talking strictly about the kids. Time is your friend.

I'm sorry you're in this position, OP. I know it's hard but you've got to try your best to be the bigger person for your boys sake.

Write him off. He sounds like a twunt who only thinks about his own feelings.