Angel fish foreplay or fighting?

I have a pair of Angels in my tank... only two of them as they have
mated and layed eggs in the past on several occasions. Anyway, lately
the one that I believe is the male keeps picking on the female and
driving her into the corner of the tank or just chasing her all over
the place when she's out and about... this happens often. Are they
getting ready to mate again? What's going on? I don't recall
noticing this happening the other times. Any input is always
appreciate.

Laura