Devastated

This morning I asked my boyfriend to see his phone and when I went through his phone I saw his Instagram DMs and he wrote to one of his homegirls insta story of one of her friends the tongue emoji like this โ€œ ๐Ÿ‘…๐Ÿ‘…๐Ÿ‘…๐Ÿ‘…โ€ and then the girl wrote back sorry bro she live in ATL and he wrote the side eye emoji โ€œ ๐Ÿ˜’โ€ like he was blown that the girl wasnโ€™t in the same state as him then to make matters worst Iโ€™m 5 months pregnant this is embarrassing weโ€™re having a gender reveal this Sunday and Iโ€™m debating if I even want to have it anymore. How can I come out with my pregnancy with him knowing heโ€™s out here worried about other females my heart is broken and I canโ€™t stop crying. What should i do ? Or how should I handle things ?