I'm very confused!

I lived in Arizona for 3 years and in my last year there  I was in a relationship. Our relationship was better than amazing, we have been dating for 1 year and 2 weeks. Before I moved to California we had sex for the first time. It's been 2 weeks since I moved and he texted saying he misses me and he loves me but on his twitter, he was talking to another and in their messages I noticed that they had had a couple of dates and had sex more than twice already. But every morning he send my a long text saying that he loves me and that I am his "bae". What do I do? Do I tell him I know about his secret love? I'm starting to feel a bit depressed and I don't know what to do?