I'm terrified to be a single mother of three at 22.

Okay there are a lot of details so I hope I explain them clearly. So my boyfriend and I always wanted to have our children close together. Our daughter was just coming up on turning one so we decided to try for another. He was talking about being engaged in the next few months so instead f rushing to have a wedding we decided to have another baby first. Thus twins were conceived. Around the same time that happened my boyfriend started having bouts of depression/anxiety. He claimed going on car rides helped him clear his head which I had no problem with.... until they became a nightly thing. He would work, come home for an hour or two and then leave me at home with our daughter until late at night- or like 2am. This was sketchy to me so I looked in his phone(not cool I know) and found a dick pic in his Snapchat saved pictures that I never received. He claimed he just forgot to send it to me. This led to me being concerned he was cheating and also concerned with the amount that he was talking to my best friend. He then started to say that or relationship has been bad for a while(it hasn't) and that we never had sex enough(true). So he kept me on hold for two weeks deciding if he wanted to be with me because I invaded his privacy and because I wasn't trusting him which reminded him of a very bad previous relationship. Now he still goes for rides, he's very rude to me, doesn't give me any affection, no sex, I feel unloved and I just can't tell if it's time to leave or not. I'm not even sure if anyone can give me an opinion at this point.