How do u know if ur partner really loves u or is just with u because ya have kids

I don’t thin my wife loves me anymore, we were high school sweetheart since 2013 we got two kids together which is the reason I think we are still together, I know the sex sucks, and I never feel any love towards me anymore like back then. She never post me on her social media but is always on it, she quick to take pictures with her cousins guys or girls but never seems to want to post me or us, mybe I’m just insecure but my gut tells me she doesn’t want to be with me anymore!she gets mad anytime I tell her I’m sad she avoids those talks, she will just bring up something I did to get around what she did it’s exhausting! I’m currently trying to start a company and she doesn’t seem supportive she will listen to everyone else for advice and not me, I’m hurting I love her but I’m not happy I can feel something is wrong I just wish she would be honest and tell me how she feels! I’d rather leave her than force myself to be with her there’s days where she’s really nice and other days she looks at me with regret. I know she compares me to other guys because that’s how she always been she compares everything in her life to other peoples it puts a lot of pressure on me because I’m not where I want to be at in life financially wise! but I’m working on getting there it just seems like she should have a positive vibe but anytime I tell her my plans I get negative vibes she will say things like let’s be realistic after I talk about a goal I set for my self I’m just tired and I’m hurting I love her and my family but I don’t want to be with a person who doesn’t love me the way I do my kids are everything to me and I know it won’t be hard to leave her I’m just going through it mentally I wake up and I can’t motivate my self I feel like I’m in a dark hole in my life that I can’t get out of! Please if there’s anybody who can understand how I feel please reach out as a man we don’t have anybody to talk to that’s why I’m on here I first found out about this app because she would use it to vent about sex not feeling good on here so yeah go figure on why I feel this way!