Should be called to repentance with love and charity, same as the rest of us.
Repentance from what, specifically?
In this case, the issue at hand is acting on sinful sexual inclinations. Christians should be clear and uncompromising in rejecting the validity of same-sex relationships, but also avoid the pitfall of singling it out as being especially worse than other forms of sexual sin that tempt heterosexual individuals or of hating those who are tempted to it. We fool ourselves if we think that we are better than others who are also struggling.
What defines validity? Is it the type if relationship in relation to opposite sex couples or the substance of it? On what basis do you know and measure that my nine year marriage to my husband is invalid but a non substantive, pressured, perhaps even loveless opposite sex marriage is valid?