The words "I can't help to wonder if you thought about me today" ARE suspicious. You have all the right in the world to ask him about this, no matter how you found out.
HOWEVER
I don't think you will ever feel secure with this man, regardless of who is 'right' or 'wrong' here. It's a relationship, not a court case. Nobody will congratulate you for "catching" him with proof. It's you and him living together and building your lives together, not a game with a winner and a loser. Even if you are "right" you're destroying the lives of both of you with your extensive snooping. If he is "right" then you won't stop until you make him prove you right, until the next woman, the next message.
What matters the most to you? To prove you are right or to be happy with this man? Because you can't have both.

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