I agree with the others. You don't have to decide anything right now.
Three months of sobriety is not so very long. My ex relapsed after 3+ months when he said he felt secure in his own recovery. He stopped going to daily AA meetings, stopped calling his sponser, and resumed contact with his still active ex! That was also the same time he began speaking of AA as a 'cult'. Lots of clues there that I didn't acknowledge.
Listen to your gut. I promise you it won't lead you wrong. I mean, sure, you can forgive him if that's how you truly feel. But forgiving, in my opinion, doesn't wipe the slate clean. And it does not mean that you trust in his actions yet. Time will tell.