My husband won’t have sex with me

My husband and I are really struggling to connect sexually and emotionally I recently gave birth to twin girls this April something we was praying for . During my pregnancy he barely touched me and that was on me due to fear of something happening to the babies but now when I touch him he pulls away and says he is not mentally there whatever that means. I recently found out he went to get tested and I confronted him about it and he denied cheating and said he was getting check out because he has discharge coming from his penis. I have look everywhere to see if he was cheating and haven’t found anything! I feel alone in my marriage and don’t know what to do and on top of that I’m sexually frustrated I just don’t feel like he loves me anymore. Any advice