CANCER FEMALE -- PROBLEM WITH CANCER MALE

I'm really curious to know.. im in a long distance relationship with my cancer guy who is sort of a gemini cusp (june 24)... we've been apart for almost 6 months and we are unsure when we will see each other again.. i have hope and believe in our relationship.. we are constantly in contact and he reminds me that he loves me often... but here's the thing.. because of the distance i think its easier to cheat.. im a cancer female and my insecurities tend to come out especially because of past bad cheating experience.. sometimes i think hes shady and i know ill never always know the truth of what hes up to..

anyway my question is.. are cancers men liars? are they cheaters? and also, are they the type to say i love you when they lie? do they avoid the topic when they are liars because he says i think wrongly of him and the situation and that there's no point in talking about it because he cant do much about my own insecurities that are in my own mind.. i dont know. i hate this feeling and i really need support in my thoughts