Someone PLEASE help a girl think straight!

I’m going to try to keep this as short as possible. But over a period of time my baby daddy/boyfriend of 6 years has been doing some things that’s not AT ALL like him in any way. Before we got together and up until we had our little boy(he’s a year & 1/2), we have always had the best sex life, we both say all the time that it’s like we were made for each other. Then I started noticing that he was buying sex toys for himself and hiding them from me so he could use them when alone. And not just male masturbators, it started with butt plugs, then multiple dildos, and cock rings. Plus I found out that he was watching transgender porn and every single time it was brought up in conversation he would lie his ass off. Well that had my mind all kinds of messed up, then to add to it I realized my panties were coming up missing. So then I started finding my panties being hid with all his other masturbating stuff. Instead of jumping to the gun and either flipping out or whatever I tried to understand, and think about it all from different perspectives. I also did a whole lot of reading online and even watched videos to try to be understanding/supportive like. Now I just happened to be playing around on our laptop and found pictures & videos of him wearing my panties, at different times and places. He has lied about all of it every time we would just slightly talk about it. So please someone throw your two sense at me!