[25F] I found my boyfriend's [29M] secret account messaging explicit models that he hid for our entire 3-year relationship. How do I navigate this deception while stuck on a lease? Should I give him another chance?

Just to preface, yes I used AI to help me write the post because I'm mentally drained and all I could write was gibberish so I just spoke to it instead and it wrote it out. This post is not fake and I am genuinely torn and broken.

The Background I am 25F, and my boyfriend is 29M. We’ve been together for almost 3 years and living together for 2. Our lease doesn't end until August. To everyone on the outside—and to me, until yesterday—he is a sweet, calm, affectionate, and wholesome guy. I felt incredibly safe with him and thought he was the man I was going to marry.

Early in our relationship, we had a conversation about porn because I wasn't comfortable with him watching it almost every day. His defense was that his porn consumption was completely separate from our relationship. He insisted it wasn't personal, he forgets what the women look like right after, and he never fantasizes about them. I accepted that and we moved forward.

The Discovery Last night, I had a gut feeling that something was off and looked through his phone. I found a secret, anonymous Instagram account. He has been using it to follow hundreds of explicit models and sex workers.

The worst part: it wasn't just passive scrolling. I found DMs where he was replying to their stories, sending them vulgar compliments, and asking them to reveal more of themselves. I checked the account history and saw he created it 8 years ago. He has been actively engaging on it through his past relationships and the entirety of ours. The past week, I even went to the ER for a medical emergency and he liked 20+ posts in the meantime.

The Confrontation When I first confronted him and asked if he was hiding something, he played dumb. He tried to force me to reveal exactly what I knew so he could tailor his lies to only what I had proof of.

After hours of confronting him, I finally dragged the actual truth out of him:

• He admitted he sent the messages because he wanted to see if the models would actually reply to him.
• He admitted his whole defense about porn being "impersonal" was a lie. He saves content, memorizes the actresses' names, and actively searches them out.
• When I asked why he hid this from me for three years, he said: "I thought if I lied, then you'd be fine and I'd be fine."

The Current Situation He is now in total panic/crisis mode. He is pleading for another chance, trying to do some acts of service. He claims he knows it was wrong and will never do it again.

I am completely devastated. I am living in a city where my main support system is him, and we are stuck in this apartment together until the end of August. My brain knows that keeping a secret double life for 8 years and actively removing my right to consent to the reality of our relationship is a massive issue. But my heart is grieving the man I thought he was and the future I thought we had.

Advice Needed: I want to give him another chance, but don't know how to navigate this.

TL;DR: Found my boyfriend’s 8-year secret Instagram where he follows and DMs explicit models. He lied about his habits our entire 3-year relationship and only confessed to the depth of it after being cornered. We live together for 4 more months.