Should I leave my GF?

So I have been with her since we met in HS. Its been 10 Years I've been with her. Our relationship has been through many obstacles good and bad. We have a child that is now 8. My mind has not settled down about coming down to my knee and popping that ring out. I feel like I am in a corner cause my mind has got me crazy about my life and what I should be doing. I can't trust her for I heard many things she's done behind my back. These made me do many bad decisions and has got me very confused. I feel like its not a relationship but just comfortable way of living. In reality its not even comfortable. We have lack of communication which puts us with lack of interest in mind and body. I just feel like there is better in life that I can have and really grow and most importantly be happy about.
Should I leave my GF?
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