It seems to me that most reasonably attractive women, in fact even many not that attractive women, have multiple relationships on the go at any one time.

Most women these days have an extremely casual attitude towards relationships and if you think you're going to get exclusivity or loyalty from any woman you're delusional, yet many men are that deluded.

Also, if you think marrying a non-Western woman is the answer to these problems think again, Asian women as well as Russian women are even worse and more notoriously disloyal and and unfaithful than Western women are.