Stay with her or leave her?

I have been with my girlfriend off and on for a little over 4 years. The total amount of time we've been 'off' is probably about 2 months, maybe 2 1/2. She cheated on me with my best friend (at the time) after we had been together for about 6 months when they went to the mall together around the holidays cause she 'wanted help getting me something'. Anyway, we broke up and I ended up taking her back around 3-4 weeks later, she was very apologetic and knew what she did was terrible. Forgot to mention she has a kid that is 5 now (was 1 when we started dating) and I love the hell outta him, his bio dad isn't in the picture and he's been calling me daddy the past couple years, because he wants me to and I would never tell him he can't do that. Sorry for all the details, just really need help.. Anyway, we have broken up a few times since then for random reasons, she's always been a flirt and makes shitty decisions when she drinks. She doesn't really drink anymore, can't remember the last time honestly. EVERY time we've broken up she has either slept with someone within 1-2 days or started 'seeing' someone within a week. We are together now, and have been the past like 11 months with no bumps, but maybe it's because I was just the best man at my friends wedding, but I've been thinking a lot about my future and about how I really don't trust her.. By the way, I have had chances to sleep with other women while we've been broken up but I just couldn't stop thinking about my girl.. WTF should I do..
Stay with her or leave her?
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