HI D., This is a tuffy. You don't want to push him away I agree, but you don't want this to go on much longer. I had something similar but just a little worse happen to me at the begining of my mariage. (for give the bad spelling it's late and I'm tired) If he is lying to you, that is a _bad sign. YOu need to nip that in the bud because even though she is in europe, things happen online now. I don't mean to be pushing your buttons, but you have to look out for yourself, and if he is being dishonest that means trouble. The 3 main keys to any relationship are, honesty, communication and trust. If he isn't honest during your communication, how can you trust him. You know what the picture he sent was and you know whether or not it is ok, but lying is what wories me bout your situation. Please understand, I'm not trying to scare you, make you mad, or anything other than my being honest and telling you what I get out of your poste.
I think you need to let him know that you are really uncomfortable with this and that you want it to stop. I mean be straight quick and to the point, "When you contact her, I vfeel like you are capable of hurting me. I really need you to stop contacting her." Or something along those lines. And if he loves you then he needs to respect you as a person, his wife, and mother of his child. I would be happy to share my story with you if you'd like, but most of all remember that you are worth being respected and xs are xs for a reason. I wish you only the best.
A.
P.S. Be strong, you are worth it.