Cancer cheats?

I'm with my Cancer man for a while now, and we are stable....somewhat. We love each other alot - and I am very very attached to him. But somewhere my instincts and intuition very strongly point to his being the cheating type. He does tend to hide things alot, and I've caught him lying red handed a few times. He used to sleep around alot when single, and I caught him flirting with a woman online once while he was on the phone with me while reassuring me on the phone while flirting with her how he doesn't even talk to any other women and if I can't trust him then he cannot do anything about it (unknown to him that woman was a friend of mine, texting me at the same time - so i knew his reassurances were a lie). Issue wasn't his flirting, issue was how he kept lying to my face calling me someone who doesn't believe his words.

I used to blindly trust and love him - but his consistent lies have killed my faith and trust in him. I told him I cannot be with him because I'm not able to trust him and it mentally disturbs me. And he got very emotional and told me he really loves me and would never cheat on me. Off late he has been trying very hard to make me trust him and has been going out of his way. But it's not working.

Somewhere deep inside everything he says seems hollow to me now 😢 I know I don't have any concrete proof to know he'll cheat - but my instincts tell me very strongly not to trust him - and I have never been wrong about these things before 😢 😢

And then I read this last night and now I'm even more disturbed.

http://www.compatible-astrology.com/cancer-men-trust-and-cheating.html

Should I just end it, for the sake of peace of mind if nothing else? I think my fears have made us reach a dead end.