I would give myself advice in regards to future girls I was involved with.
To not make the mistakes that lead to me squandering what I had with my first gf, her being the one that understood and accepted me the most, compared to the future bitches I associated with. Considering 2nd gf was a major compulsive liar and jerked me around for her own amusement, even to the extent of telling me she had a miscarriage when it was intentional abortion. 3rd gf was better than the 2nd, but I was going through a somewhat irreligious/atheist episode and she was very Christian, something she didn't like. At some point she quite literally up and disappeared out of my life, I found out close to a year later that she met and got engaged / married to someone else...
so in short I'd make things work out with the 1st one.