Hiya there
I think its sensible to both value the friendship and the marriage.. honouring the marriage is helpful for both it stops gossip about both yourself and the married friend. Always meet in public places if you do meet them alone and keep the arrangements transparent to the spouse, be sensitive especially early in the marriage. , honour them as a couple and meet them as a couple that way you give no room for malicious gossip.
I have known a couple for over 25 years now, and am firm strong friends with both the man (who is my primary friend as it were) and the woman, but I always call at the house when I know my friend is in and if on occasion he is out, I say I will call back his wife knows me very well we are firm friends, and there is absolutely no offence taken on either side.
Maybe it is just me , but I don't really believe that a truly 'platonic' relationship can exist, at some point one will have an attraction to the other if they spend lots of time together. while both are single this is less of a problem, but when one (or both) are married it can lead to complications that are simply best avoided.
I see it not as cutting a friendship out of my life, but inviting in a new person, a couple whom I should treat with honour, as if they are one, I see it as gain.. not loss.
Malby