my cat is extremely stressed

i need help i have a 2 yrmale cat and hes very fond of going outside which is okay because I take him outside every day. But ever since we moved into this new home, my cat has run away twice. He got beaten severely by a bigger male cat, and now that stray cat knows our home’s location and visits every day, spraying around the house. This stresses my cat out a lot, and because of that, he has also started peeing on furniture and in corners.