My (26F) bf (39M) has been using my bras to pleasure himself with. How do I get over the manipulation I feel like I've been subjected to?

I just found out that my bf of over an year, who is 39 and divorced with 2 kids, has been using my bras to pleasure himself with. He buys them for me, leaves them out by 'mistake' and then does his business with them. He's also touched my underwear and slept with them. I've had no issue with him buying me stuff and I've never made him feel like I don't want him or that he's not attractive. This is my first real relationship ever and I don't know how to process this. I confronted him and he was extremely apologetic, begging me to stay with him and to give him another chance. I feel so disgusted and violated and I don't know how to feel okay about this. Please help.