Help me feel better about my situation

[Lorddenning1]

I just need a hand hold from the ladies of MN, or a kick up the arse.

Bit of a back story, I an a single mum of 2 DS, 8 and 3. My ex does not care about the children, he hardly asks about them, doesn't see them very (he does have his reasons I suppose) he has fought me along the way over money for them. I have full custody and there is never any support from him.
A year ago I met a lovely guy, an old friend and he is the nicest guy Iv known him a while and I am planning a future with him (finally met someone who I can share my life with and for once feel genuine love and happiness)
But seeing what a great dad he is to his own daughter hits home how much my kids don't get from their own dad. My new partner puts his daughter first over everything, pays over the odds maintenance, bends over backwards to see his child and works and respect her mother as he sees this is the best way to be for their child.
It leaves me with a bad taste in my mouth and it makes me upset and jealous, I know this is crazy and I don't want to feel like this but I can't help it. My kids have me and no one else, they don't even have doting grandparents to take them out and spoil them. They have me only and I feel sad for them. I work full time and I'm always tired and sometimes I shout too much and I feel so guilty. They didn't ask to be born and I feel like it's all my fault. They never go without and are very loved and are happy boys but I can't help but compare mine to his daughter :( my emotions are mixed up and I feel angry, but not 100% sure who I'm angry at.
Please tell me to cheer up and get a grip, I feel like a need an honest frank opinion on the situation or someone who has been through this and can tell me this is normal feeling to have

Bloody hell I could have written that.... exact same situation. All that helps me is thinking that if he was a shit dad to his child I wouldn’t want to be with him, one of the main reasons I love him is because he is so kind and caring and his family mean so much to him. It does make me bitter my kids will never have that from their father and how it’s so unfair on them that I picked a dick head to have kids with but we just gotta be grateful we have a good one now. Not much help sorry.... I hope someone else will be along soon with better advice that will help us both out!

@Doggotired that's how I feel, guilty that I chose a bloody idiot to have kids with and that's y I blame myself, 9 years together, a weed addiction as throw in gambling too. He wasn't like that the whole time tho but it got worst and I resented him massively, we argued all the time and eventually he walked out and left me to raising them alone, hit a new girlfriend after 2 weeks and it's just gone downhill since then.
How can I get over the jealous thing, y am I even jealous in the first place, it's not like I want her dad to be shit like mine have, and him being thoughtful and caring is one of the reasons I want to spend my life with him. It's so messed up, throw me a pity part please

I will come to that party 😂 I honestly don’t know why we feel like this.... all I can think is that it’s emphasises how crappy our kids dads are??