I've been in a relationship for a few years and living together for about a year, even discussed marriage and future plans. Recently trust was broken over a different subject and was being worked through. However I still suspected something was off, and I was correct. A package was left open in a closet containing womens lingerie not in my size, and an empty box that had contained an anal toy. When confronted my SO said it was just a long distance online thing. Later I broke boundaries and looked through phone to discover he buys womens used lingerie and also purchases toys. The conversations were very sexual, flirty and included exchanging photos, some of him in the items he purchased. Im an open minded person, however I think a kink should be disclosed early on to ensure compatability. I also feel I'm just not what he wants despite his consistency in expressing he loves me. When confronted he claimed this is an addiction not a kink or fetish, he is embarrassed and not ready to discuss with me. However he is sharing this part of himself with multiple women online. I don't know what to do, but I think I need to leave him because I'm not sure I'll ever be comfortable with this part of him even though I love him.