I have to ask "Why?"

I'm in a heterosexual relationship of 12 years.

Suddenly, my boyfriend wants to have sex with a lot of other women. He hasn't done so, yet, but I wondering "why", this has started happening all of the sudden?

He wants to have sex with my 90 yr. old woman, friend. I said "No, Way!". Now he is talking about having sex with an old friend, and wants to get something going (again), with her, but she lives 2000 miles away.

He constantly is masturbating, using the excuse that he needs to go lay down, as he isn't feeling well, or just needs some rest. We live in a 5th wheel, so I can feel it when he is "jerking" the trailer, so to speak.

I have made it clear that I do "NOT", want anyone else intruding into our relationship, yet he is continuing to pressure me.

This may be a "relationship" breaker, for me.

What do ya'll think?

Thanks,