Is our relation and compatibility good for a long loving time?He is an Ox and I am a Pig, we both are divorced and in our 60ties, with a very young spirit

but in our process to learn from one another, I discover one case of infidelity,he say was something that will never happen again, was something he arrange from the Internet before he meet me. Now I am his one and only love...that is what he say.
My question is, Oxses are cheaters by nature? I still want to put everything behind but the doubt is still there.
Please advise
AM