Checking phones in relationships

No, I haven't.
I've been with Ari since 1982 and I know he's never been with another woman since before then. Basically, women love him as a friend but don't find him attractive.

If you don't want to be cheated, learn about the man's history before you get involved. Some men may learn from past mistakes, but most will continue to behave according to character. And choose someone who has similar values to yours.

You could also try a man who's a fair bit older. They're not immune to infidelity, but if you keep them sexually happy they'll be far less likely to wander. For most, their libido slowly falls as the years go by. The downside is they might end up with no desire while you're still keen.

Another option, one you might not like, is to just give up on the idea of monogamy. Create a pact with your partner that he won't get another woman pregnant or give you an STD - in other words, if he messes around he agrees to wear a condom.
And ask him to keep you first in his heart and to at least be honest with you if things change.

Jealousy can be a crippling and deadly emotion; it's really not worth the stress and suffering it causes.

However, I think checking phones is going WAY too far.
If you can't trust someone to tell you the truth then there's no point in being with them at all.

I agree with what n0nam0u5 said.