Question:
Is there a halacha about the husband not being able to stay away from his wife in his first year of marriage?
Answer:
Yes there is such an idea, see Sefer Hachinuch Mitzvah 582. However if she is mochel, or for a mitzva, it is permitted,
Sources:
See Chochmas Adom 129-18, Shulchan Haezer 12-10, Bais Chasanim 20-13 ftnt. 21.