My husband is aggressively pursuing another woman - what should I do - read details please?

I was engaged to my now husband for 10 years and we got married 4 months ago. We have 1 child together who is 4. I nearly forced him into the marriage so that as a family we'd have the same last name for our child. I feel as though he fell out of love with me years ago but we have our moments and so i believed we could get the spark back if we tied the knot officially. In any case. I recently saw notifications on his phone and looked while he was in shower and discovered that him and a friend of his from high school have reconnected on social media and they have been talking nearly everyday. From what I have read - he is aggressively pursuing HER and she consistently reminds him that he is married and doesn't respond to his validation requests. He tells her that he misses her, that he thinks about her, that she's stunningly beautiful, his dream girl, and even implies he'd leave me for her, etc etc. She lives quite far away and appears to be some sort of executive that went to an ivy league school and he has been begging her to let him come visit her. She has been shutting it down but says she loves being friends again because its brings "nostalgia". However I can also see they've had multiple calls. This girl is beautiful and she is a gym person like my husband - they appear to be bonding over fitness. I feel very insecure about this. She looks nothing like me as well - completely different race. Do I tell my husband I went through the phone or what do I do? Only way to discuss this is by admitting I went through his phone. At the moment he hasn't even seen her yet.

My husband is aggressively pursuing another woman - what should I do - read details please?
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