It's call karma, many in /k don't believe.

She didn't end a relation clean but you didn't refuse the underground relationship either .... so both are suffering the consequences right now.

Lucky for her the ex/husband is stupid enough to woo her back despite that rocky relationship.

Hence now you are suffering the full blow of the effect.

Maybe love blind you for a bit, but you where not thinking straight in the first place.

Sacrifice is worth nothing when you bind them with hopes and wishes, what you give you must accept it as a lost, otherwise you are just making a trade in hopes of benefits.