Is he cheating on me?

Yesterday something unbelievable happened. I got in my boyfriend’s (of 11 Months) phone to order some food and what do I find? TINDER! He has been using it for months. I confront him with what I found and his explanations are, “he is bored at work and wanted to see the crazy profiles!” The next one he told me was that “he just didn’t feel worthy of me and he needed to see if girls actually like him to prove he was worth”. Idk if I am being to harsh or not! (Oh and btw he knew it was wrong Bc he has been deleting this app off his phone everyday for the last three months!) Then again tonight I go to just take selfies on his phone and he completely freaks out on me! Please tell me what you think.

Just a side note. We recently found out that I am 8 weeks pregnant!

Thank you,

Anna Lauren