oh and i just contacted the devalopers but they said :
We are constantly observing the windows-phone-market. Considering the low number of sold smartphones running with Windows, we have decided to keep observing the market development. We are working on an alternative solution, but it takes time.
For now, you have the opportunity to use our website:
LOVOO - People like you. As far as it is available for your windows phone, we recommend to use the browser „Google Chrome“ or „Mozilla Firefox“, because LOVOO is optimised for these browsers.
so no official one in sight .. any app clients would be appreciated