Need some advice ( sorry for the long post)

Me and my husband married 14 years , we have 3 kids , the youngest near to 2 years. We had no sex life ever since I’m pregnant with the 3rd. Even before that, every time I’m the one who asked for sex.. sometime he just like doing his “job” and now after I gave birth to our 3rd baby, he every time rejected me… no mood , tired , etc … he lost of interest on me? He has affair ? He has a very close female friend , he says his best friend, every month at least will go out once to have a drink with her until 2-3am ,until the shop closed .. every time when I asked anything relates to this female friend , he will over react ( I felt ) , he just simply raised up his voice and scold me that think too much, and I don’t even know what wrong , (it’s just simple caring, wants to know who is his friend ). she has bf and now she married .. sometimes when I saw him messaging, and I walked to him he will quickly closed the apps .. don’t know is coincidence or what.. what I felt is we are married , shouldn’t have secret even if your message between friend no harm if I read them …. And I just walk by.. when I ask him hang out with who, he will tell me but not straightforward kind , ask one tell one that kind … cannot tell me like I go out tmrw with who at where .. I need to ask further like , go where , he will say go to town , then I ask again , go to town which area .. what shop like that … what I don’t understand is if both of you is clearly friend , why cannot just tell , feel like want to hide … that girl might have nothing she is young like younger than me 10 years .. I felt like he treat her better than me , he talk to her in one night more than talk to me in a month … he boring with me ? I felt he means to me and not respect me .. I’m just a helper in the house.. housemate to him .. I got the urge to call that girl to not date my husband … but I’m scare she will let my husband know .. what’s should I do ? I’m kind of depressed.. and I sad every time they hang out … I always wait him to back home then only can sleep .. and i cried every time.. do u think my husband cheating on me? He loves that girl ?