As you know, an idea for a startup costs nothing (and it costs - a successful implementation, the ability to attract visitors to it and make money on them), so it’s not a shame to share it. Especially if he himself would use the service, which is still not going to develop.
Given:
1. There is a successful startup in the field of dating Tinder, which is popular because of its ease of use. But because of the same simplicity, it turns out that it is well suited for one-time dating, but not suitable for dating for serious relationships.
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2. There is an increasingly popular (including in Russia) dating industry for serious relationships and an audience ready to pay money for such services.
Decision:
Make the same easy-to-use service that would suit an uncovered audience.
The principal difference can be achieved with 2 changes:
1. Hard limitation of the search range (up to 1 km or even less)
2. The opportunity to immediately write to the candidates you like (and not wait for reciprocity)
This will allow you to quickly establish contacts in order to look at each other live right now (being in one exhibition, festival, etc.) and not overload the most popular users (beautiful girls) with a bunch of messages.